Support the MySQL database administration statements

[kyleconroy]

Implements the mysql_unsupported_admin statement coverage group (MySQL 26.7 §15.7): its error goldens turn into Restore() goldens and the group is renamed to mysql_admin with expanded coverage (15 → 38 cases), following the mysql_compound precedent from #38.

Parser (parser/parse_mysql_admin.go, new)

Grammar written from the MySQL 26.7 reference manual, since these statements postdate the goyacc grammar:

• CHECK TABLE with FOR UPGRADE / QUICK / FAST / MEDIUM / EXTENDED / CHANGED
• CHECKSUM TABLE with QUICK / EXTENDED
• REPAIR TABLE with NO_WRITE_TO_BINLOG / LOCAL and QUICK / EXTENDED / USE_FRM
• CREATE [AGGREGATE] FUNCTION [IF NOT EXISTS] ... RETURNS {STRING|INTEGER|INT|REAL|DECIMAL} SONAME '...' — the loadable function form only, hooked into the CREATE dispatch; stored functions still fail, now at their parameter list, which moves one mysql_unsupported_ddl error golden
• INSTALL COMPONENT ... [SET ...] (the SET clause reuses VariableAssignmentList), UNINSTALL COMPONENT, INSTALL PLUGIN ... SONAME, UNINSTALL PLUGIN
• CLONE LOCAL DATA DIRECTORY [=] '...' and CLONE INSTANCE FROM 'user'@'host':port IDENTIFIED BY '...' [DATA DIRECTORY [=] '...'] [REQUIRE [NO] SSL]
• CACHE INDEX and LOAD INDEX INTO CACHE, sharing a table/partition/index spec node (partition lists, PARTITION (ALL), PRIMARY as an index name, IN default, IGNORE LEAVES)
• RESET PERSIST [[IF EXISTS] var] — the other RESET forms deliberately keep failing at the RESET token, so the mysql_unsupported_replication goldens are byte-identical
• The MySQL-syntax resource group options TYPE, VCPU, THREAD_PRIORITY, and ENABLE/DISABLE [FORCE] join the TiDB dialect options in DirectResourceGroupOption

AST (backwards-compatible additions only)

New nodes in ast/admin.go: CheckTableStmt, ChecksumTableStmt, RepairTablesStmt (named to avoid the existing ADMIN REPAIR TABLE RepairTableStmt), CreateLoadableFunctionStmt, InstallComponentStmt, UninstallComponentStmt, InstallPluginStmt, UninstallPluginStmt, CloneStmt, CacheIndexStmt, LoadIndexStmt, ResetPersistStmt, and the shared CacheTableIndex spec, plus SEMCommand strings in ast/sem.go. ResourceGroupOption gains new ResourceUnitType values and IntValue/BoolValue/Force fields. CloneStmt implements SecureText() to mask the donor password, following ChangeReplicationSourceStmt.

Keyword tables

AGGREGATE, CHANGED, CLONE, COMPONENT, FAST, INSTALL, LEAVES, PERSIST, PLUGIN, RETURNS, SONAME, STRING, THREAD_PRIORITY, UNINSTALL, UPGRADE, USE_FRM, and VCPU become unreserved keywords, matching their MySQL 26.7 classification; TestKeywordsLength counts updated (690 → 707, reserved count unchanged).

Testing

• go test ./... -count=1 -timeout 120s passes; gofmt and go vet clean.
• Every new case round-trips (restore output re-parses to a deep-equal AST) via the file-driven suite.
• testdata/errors.json is unaffected — none of its cases start with these statement heads, so TestRDErrorFidelity still validates the goyacc-recorded messages unchanged.

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