[core] Maintain primary-key full-text index archives

[JingsongLi]

Summary

Build on #8649 by adding LSM-style incremental maintenance for primary-key full-text index archives.

Changes

• add primary-key full-text index configuration and schema validation
• integrate bucket-local full-text maintenance with BucketedPrimaryKeyIndexMaintainer
• reuse PrimaryKeyIndexLevels and the Vector/Sorted compaction options to consolidate similarly sized archives and rebuild stale coverage
• publish archive replacements through the existing append/compaction increments, including asynchronous completion, abort, rollback, and cleanup handling

Scope

• no index.type option; full text remains the implicit/default index type
• no definition fingerprint is persisted
• query/search integration and Flink/Spark exposure are deferred to follow-up PRs

Testing

• mvn -pl paimon-core -am -DskipTests package
• mvn -pl paimon-core -am -Pfast-build -DfailIfNoTests=false -DwildcardSuites=none -Dtest='PkFullTextIndexFileTest,PkFullTextBucketIndexStateTest,BucketedFullTextIndexMaintainerTest,BucketedPrimaryKeyIndexMaintainerTest,PrimaryKeyIndexDefinitionsTest,PrimaryKeyIndexWriteTest,PrimaryKeyFullTextIndexValidationTest,SchemaManagerTest' test
• git diff --check origin/master..HEAD

The focused test set runs 84 tests.