feat: add `LastBy` / `FirstBy` features to `NaturalJoin`#6604

Merged

lbooker42 merged 19 commits intodeephaven:mainfrom lbooker42:nightly/DH-18491-lab-optimized-nj

Feb 5, 2025

+6,126-2,962

Commits on Jan 24, 2025

Introduced NaturalJoinType object, tests still pass.
lbooker42
committed

Commits on Jan 27, 2025

Static FIRST_MATCH, LAST_MATCH tested and working, Prep for adding joinType to Incremental versions.
lbooker42
committed

Commits on Jan 29, 2025

Commits on Jan 30, 2025

Working, tests passing. Not yet implemented ADD_ONLY optimization.
lbooker42
committed
Tests passing code coverage examined. 100% reached in main lines, not 100% in alternate.
lbooker42
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Commits on Jan 31, 2025

Commits on Feb 3, 2025

Commits on Feb 5, 2025

Address PR comment.
lbooker42
committed