Support providing schemas for some columns in a table

[suvayu]

Related issues

Closes #67

Checklist

• [x] I am following the contributing guidelines
• [x] Tests are passing
• [x] Lint workflow is passing
• [x] Docs were updated and workflow is passing

[suvayu]

I can't replicate this locally:

Test Summary:              | Pass  Total  Time
Test convenience functions |    5      5  7.4s
Test Summary:     | Pass  Total  Time
Parsing utilities |   12     12  6.7s
Test Summary:             | Pass  Total  Time
Follow references in JSON |    4      4  1.1s
Test Summary: | Pass  Total  Time
Utilities     |    9      9  0.3s
Test Summary: | Pass  Total   Time
Read CSV      |   23     23  16.4s
Test Summary:    | Pass  Total  Time
Set table column |    7      7  5.7s
     Testing TulipaIO tests passed

The error is also a bit strange:

Execute of query "DESCRIBE rep_periods_mapping" failed: Catalog Error: Table with name rep_periods_mapping does not exist!
  Did you mean "pg_proc"?

I don't no where pg_proc could come from.

[codecov[bot]]

Codecov Report

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

Project coverage is 68.86%. Comparing base (67a2d37) to head (5d9a148).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #68 +/- ## ========================================== + Coverage 68.40% 68.86% +0.46% ========================================== Files 7 7 Lines 269 273 +4 ========================================== + Hits 184 188 +4 Misses 85 85 ```

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