feat: Built-in handling of default-target-schema for SQL Targets

[BuzzCutNorman]

This is an attempt to add support for a default_target_schema , as mentioned in issue #1086, into the SDK for SQL Targets.

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📚 Documentation preview 📚: https://meltano-sdk--1157.org.readthedocs.build/en/1157/

[edgarrmondragon]

This module supports PEP 585

[codecov]

Codecov Report

Merging #1157 (601c5e2) into main (61ed7b4) will decrease coverage by 0.03%.
The diff coverage is 86.36%.

❗ Current head 601c5e2 differs from pull request most recent head 3e599fa. Consider uploading reports for the commit 3e599fa to get more accurate results

@@            Coverage Diff             @@
##             main    #1157      +/-   ##
==========================================
- Coverage   83.56%   83.53%   -0.04%     
==========================================
  Files          42       42              
  Lines        3881     3892      +11     
  Branches      659      661       +2     
==========================================
+ Hits         3243     3251       +8     
- Misses        474      475       +1     
- Partials      164      166       +2     

Impacted Files	Coverage Δ
singer_sdk/sinks/sql.py	89.18% <60.00%> (-1.47%)	⬇️
singer_sdk/target_base.py	86.02% <93.75%> (-0.43%)	⬇️
singer_sdk/helpers/capabilities.py	91.52% <100.00%> (+0.14%)	⬆️
singer_sdk/tap_base.py	68.51% <0.00%> (-0.15%)	⬇️
singer_sdk/connectors/sql.py	77.77% <0.00%> (-0.09%)	⬇️
singer_sdk/_singerlib/messages.py	100.00% <0.00%> (+2.38%)	⬆️

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[edgarrmondragon]

Forgot to merge this one 😅.

Thanks @BuzzCutNorman!