feat(c/driver/postgresql): add validation suite and override tests

[Mandukhai-Alimaa]

This PR contains:

• Setup validataion suite for the postgresql driver. (128 tests pass. 0 failing. Decimal ingest test, and decimal bind tests were skipped due to bug and the fix has not been merged yet. feat(c/driver/postgresql): Improve conversion of decimal to Postgresql numeric and add tests #3787)
• PostgreSQL specific test overrides
• Update postgresql integration test in CI workflow to run validation tests
• Update RAT license exlusions file to ignore the .lock files and test sql files.

There was a small change made in the c/driver/postgresql/result_helper.cc due to the segfault when the number of query parameters doesn't match the number of result columns. The test that triggered the bug was calling get_parameter_schema() on SELECT 1 + $1 + $2 .

This query has 2 parameters but returns only 1 result column (the computed sum). The code was incorrectly using PQfname(result_, i) to retrieve parameter names, but PQfname() actually retrieves result column names from the result set. When iterating through parameters, the first iteration (i=0) would work fine accessing column 0, but the second iteration (i=1) would access an out-of-range column. PQfname() returns NULL for out-of-range column numbers, and passing this NULL pointer to AppendChild() as a C string causes the segfault.

[lidavidm]

If multiple vendors do this, we should probably add a flag to the test itself instead of requiring overriding this test every time

[Mandukhai-Alimaa]

Created an issue for it in the validation repo (adbc-drivers/validation#140). I will leave a TODO in the code for now and come back and fix it after I implement a separate flag in the validation repo.

[lidavidm]

Thanks!

[lidavidm]

@Mandukhai-Alimaa can you file issues to fix any skipped tests?