Support the MySQL txn, replication, DML, and DDL statement coverage groups

[kyleconroy]

Implements all four remaining mysql_unsupported_* statement coverage groups from #38, one commit per group, following the #39/#40 precedent: each group's error goldens turn into Restore() goldens and the group is renamed with expanded coverage. All grammar is written from the MySQL 26.7 reference manual in the style of parser.y, since these statements postdate the goyacc grammar.

mysql_unsupported_txn → mysql_txn (18 cases)

• XA {START|BEGIN}/END/PREPARE/COMMIT/ROLLBACK/RECOVER with xid (gtrid [, bqual [, formatID]]), JOIN/RESUME, SUSPEND [FOR MIGRATE], ONE PHASE, and CONVERT XID; XA BEGIN canonicalizes to XA START (ast/xa.go, parser/parse_xa.go)
• LOCK INSTANCE FOR BACKUP and UNLOCK INSTANCE join the LOCK/UNLOCK families in parse_misc.go

mysql_unsupported_replication → mysql_replication (31 cases)

• PURGE BINARY LOGS {TO | BEFORE} and RESET BINARY LOGS AND GTIDS; the removed pre-8.4 spellings (PURGE MASTER LOGS, RESET MASTER, CHANGE MASTER TO, RESET/START/STOP SLAVE) are not parsed, matching the CHANGE MASTER TO precedent from Align keyword tables with MySQL 26.7 and support CHANGE REPLICATION SOURCE TO #36
• CHANGE REPLICATION FILTER with all seven filter types — the _DB, _TABLE, _WILD_, and REPLICATE_REWRITE_DB pair value forms, empty () values, and FOR CHANNEL
• RESET REPLICA [ALL], START REPLICA (thread types, UNTIL options including bare SQL_AFTER_MTS_GAPS, USER/PASSWORD/DEFAULT_AUTH/PLUGIN_DIR connection options, FOR CHANNEL), STOP REPLICA, and START/STOP GROUP_REPLICATION
• parse_replication.go now owns the START, STOP, and PURGE statement heads and routes their non-replication alternatives back to parse_txn.go/parse_brie.go; StartReplicaStmt and StartGroupReplicationStmt implement SecureText to mask passwords like ChangeReplicationSourceStmt

mysql_unsupported_dml → mysql_dml (26 cases)

• HANDLER OPEN [[AS] alias], HANDLER READ (indexed compare form with = <= >= < >, indexed and table-scan FIRST/NEXT/PREV/LAST forms, WHERE, LIMIT), and HANDLER CLOSE (parser/parse_handler.go)
• IMPORT TABLE FROM and LOAD XML with all documented clauses, reusing the LOAD DATA helpers
• SELECT ... INTO var_list and INTO DUMPFILE, filling in the SelectIntoVars/SelectIntoDumpfile enum values that existed unimplemented; the INTO clause also parses in the common position between the field list and FROM, restoring in the trailing position

mysql_unsupported_ddl → mysql_ddl (70 cases)

• CREATE/ALTER/DROP EVENT with AT and EVERY ... STARTS/ENDS schedules, ON COMPLETION, ENABLE/DISABLE [ON REPLICA], COMMENT, RENAME TO, and DO bodies
• CREATE/DROP TRIGGER with BEFORE/AFTER, INSERT/UPDATE/DELETE, FOR EACH ROW, and FOLLOWS/PRECEDES
• Stored CREATE FUNCTION (parameter list, RETURNS type, characteristics, RETURN or compound bodies), ALTER FUNCTION/PROCEDURE, and DROP FUNCTION; RETURN joins ProcedureProcStmt, and CREATE FUNCTION dispatches between the stored and loadable forms on the parameter list
• The DEFINER = user clause on views, events, triggers, procedures (new ProcedureInfo.Definer field), and functions, with the statement head peeking past the clause to dispatch
• ALTER VIEW mirroring CreateViewStmt; CREATE/ALTER/DROP SERVER; CREATE/ALTER/DROP [UNDO] TABLESPACE and LOGFILE GROUP with a shared option catalogue; CREATE/DROP SPATIAL REFERENCE SYSTEM (CREATE SPATIAL now dispatches between the index and SRS forms); CREATE/ALTER/DROP LIBRARY
• CREATE/ALTER JSON DUALITY VIEW with the JSON_DUALITY_OBJECT('key' : value, ...) select-list constructor as a new expression atom
• The remaining ALTER INSTANCE forms (ROTATE {INNODB|BINLOG} MASTER KEY, RELOAD TLS FOR CHANNEL, RELOAD KEYRING, ENABLE/DISABLE INNODB REDO_LOG) and the USING (expr) spelling plus DROP for MASKING POLICY

Keyword tables

40 new tokens, classified to match MySQL 26.7: BEFORE, DETERMINISTIC, EACH, MODIFIES, READS, RETURN, and UNDO become reserved; 32 words become unreserved; JSON_DUALITY_OBJECT is a NotKeywordToken. Free-form words that are not MySQL keywords (REFERENCE, the SRS attribute, server option, size option, and replication filter/option names, ACTIVE/INACTIVE, KEYRING, REDO_LOG) are matched case-insensitively in identifier position, following the SIGNAL information-item precedent from #38. Before reserving anything I verified none of the newly reserved words appear as identifiers in the existing test corpus or testdata/errors.json, which is byte-for-byte unaffected.

Notes

• Unlike ProcedureInfo, the new body-carrying nodes (events, triggers, functions) traverse their body statement in Accept, so most bodies round-trip without canonical spelling; the two BEGIN...END test cases still use canonical Restore spelling because ProcedureBlock.Accept deliberately does not traverse its inner statements (the Map MySQL 26.7 statement coverage and support SIGNAL, RESIGNAL, and GET DIAGNOSTICS #38 limitation)
• FieldType.Restore (not CompactStr) restores function parameter and return types so unspecified display widths round-trip
• ReplicationSourceOption.Value may now be nil (bare option names like SQL_AFTER_MTS_GAPS); all ast changes are additive
• The lexer test for AT now expects the keyword token instead of a plain identifier

go test ./... -count=1 -timeout 120s passes on every commit, and regenerating all goldens with -update produces no drift outside the four renamed groups.

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