fix: Issue 1497 generate partitions custom query

[sundar-mudupalli-work]

Description of changes

These changes fix a number of issues, standardize the generate partitions tests across the different engines and have some minor cleanup.

Generate Partition tests
In order to not break prior builds, a new table pso_data_validator.test_generate_partitions_v2 was created on all engines. In nearly every engine a composite key consisting of string, integer, timestamp, date and boolean value is used to generate partitions. There are issues with engines including Impala and MS SQL Server, MySQL, Oracle, and Teradata

Cleanup

• moved the function to generate SQL from Ibis tables into util.py
• Replaced usage of ibis TableExpr type with Table type - they are synonymous and the latter is documented.

Issues to be closed

1497 Generate Partitions With (complex) custom query
1183 generate table partitions replaces whitespace in primary keys with a single space.
923 generate-table-partitions generates invalid SQL in filter clause when a timestamp field is part of the primary-key

Checklist

• I have followed the CONTRIBUTING Guide.
• I have commented my code, particularly in hard-to-understand areas
• I have updated any relevant documentation to reflect my changes, if applicable
• I have added unit and/or integration tests relevant to my change as needed
• I have already checked locally that all unit tests and linting are passing (use the tests/local_check.sh script)
• I have manually executed end-to-end testing (E2E) with the affected databases/engines

[sundar-mudupalli-work]

/gcbrun

[sundar-mudupalli-work]

/gcbrun

[nj1973]

Mostly nit pick comments.

[sundar-mudupalli-work]

/gcbrun

[sundar-mudupalli-work]

/gcbrun

[nj1973]

LGTM.