Raise `UserWarnings` for Unused Numerical Distributions when using `GaussianCopulaSynthesizer`

[pvk-developer]

Resolves #2296 CU-86b2w3cnn

[sdv-team]

Task linked: CU-86b2w3cnn SDV - When using GaussianCopula, show a warning if a column in numerical_distributions cannot be applied #2296

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.66%. Comparing base (5741ee5) to head (160bbf4). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2301 +/- ## ========================================== + Coverage 98.65% 98.66% +0.01% ========================================== Files 58 58 Lines 6078 6078 ========================================== + Hits 5996 5997 +1 + Misses 82 81 -1 ``` | [Flag](https://app.codecov.io/gh/sdv-dev/SDV/pull/2301/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sdv-dev) | Coverage Δ | | |---|---|---| | [integration](https://app.codecov.io/gh/sdv-dev/SDV/pull/2301/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sdv-dev) | `82.34% <100.00%> (+0.03%)` | :arrow_up: | | [unit](https://app.codecov.io/gh/sdv-dev/SDV/pull/2301/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sdv-dev) | `97.48% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sdv-dev#carryforward-flags-in-the-pull-request-comment) to find out more.

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