feat(taps): Allow sort checking to be disabled

[ilkkapeltola]

This change adds a new boolean property to core: check_sorted
By default, check_sorted = True, which is the behavior currently when is_sorted = True.
However, there are API's that are sorted, but not by replication_key.

This change allows for an API that is truly ordered, but where the replication_key is not an incremental one.

Closes #729

[aaronsteers]

@ilkkapeltola - thanks for this contribution! 🙏

This looks good to me on first pass but I'll ask @edgarrmondragon to take a more detailed review.

If there are any tests you could add, those would be appreciated, but I think most of this does flow through existing test cases. I think codecov will give info on which code paths are reached or not, if that's helpful.

Also, if can you add info on manual testing you've run, that's always appreciated as well.

[codecov-commenter]

Codecov Report

Merging #730 (2197749) into main (2166416) will decrease coverage by 1.34%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #730      +/-   ##
==========================================
- Coverage   86.84%   85.49%   -1.35%     
==========================================
  Files          34       34              
  Lines        3383     3386       +3     
==========================================
- Hits         2938     2895      -43     
- Misses        445      491      +46     

Impacted Files	Coverage Δ
singer_sdk/helpers/_state.py	77.57% <100.00%> (-1.87%)	⬇️
singer_sdk/streams/core.py	87.17% <100.00%> (-1.75%)	⬇️
singer_sdk/helpers/_catalog.py	75.51% <0.00%> (-16.33%)	⬇️
singer_sdk/helpers/_typing.py	64.34% <0.00%> (-9.31%)	⬇️
singer_sdk/streams/rest.py	88.51% <0.00%> (-4.73%)	⬇️
singer_sdk/authenticators.py	70.17% <0.00%> (-3.51%)	⬇️
singer_sdk/tap_base.py	72.76% <0.00%> (-1.88%)	⬇️

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[edgarrmondragon]

@ilkkapeltola This looks good to me! We'll ship this in the next release 😄