Implement remaining TSQL set operations.

[asnare]

Changes

This PR implements support for parsing set operations with TSql: UNION [ALL], EXCEPT and INTERSECT.

The grammar previously supported these but they were not being converted to the IR.

Linked issues

Resolves #1126. Resolves #1102.

Tests

• [x] added unit tests
• [x] added transpiler tests
• [x] added functional tests

[github-actions[bot]]

Coverage tests results

464 tests  +5   427 ✅ +5   4s ⏱️ ±0s   6 suites ±0    37 💤 ±0    6 files   ±0     0 ❌ ±0 

Results for commit c5ed175c. ± Comparison against base commit a08cd619.

:recycle: This comment has been updated with latest results.