feat(changelog): support full-compaction mode changelog producer

[lszskye]

Purpose

Linked issue: #174

Support changelog-producer=full-compaction for primary-key tables.

This change:

• adds FullChangelogMergeFunctionWrapper to compare max-level records with merged results and generate INSERT, UPDATE_BEFORE, UPDATE_AFTER, and DELETE records;
• adds FullChangelogMergeTreeCompactRewriter and wires it into the compact manager factory;
• generates changelog files when compaction outputs to the maximum level;
• supports changelog row deduplication and ignored fields;
• enables streaming reads of full-compaction changelog manifests;
• limits the initial full streaming scan to max-level files so pending lower-level changes are not emitted twice;
• removes the unused output-level argument from the regular MergeFunctionWrapperFactory;
• removes the validation that previously rejected the full-compaction changelog producer.

Tests

Added UT for:

• single-record full-compaction results;
• INSERT, UPDATE, and DELETE changelog generation;
• changelog row deduplication;
• row-deduplication ignored fields;
• rejecting multiple max-level records for the same key;

Added integration coverage for:
WriteAndReadInteTest