feat: Add support for new BATCH message type in taps and targets

[edgarrmondragon]

Related:

• Closes feature: Add built-in support for BATCH message type (aka FAST_SYNC spec) #9

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📚 Documentation preview 📚: https://meltano-sdk--904.org.readthedocs.build/en/904/batch.html

[codecov]

Codecov Report

Merging #904 (42d980b) into main (aab68a1) will increase coverage by 0.59%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main     #904      +/-   ##
==========================================
+ Coverage   81.18%   81.77%   +0.59%     
==========================================
  Files          36       37       +1     
  Lines        3555     3742     +187     
  Branches      718      746      +28     
==========================================
+ Hits         2886     3060     +174     
- Misses        492      500       +8     
- Partials      177      182       +5     

Impacted Files	Coverage Δ
singer_sdk/io_base.py	76.47% <66.66%> (-1.31%)	⬇️
singer_sdk/mapper_base.py	56.14% <66.66%> (+0.58%)	⬆️
singer_sdk/sinks/sql.py	78.48% <80.00%> (-0.47%)	⬇️
singer_sdk/helpers/_batch.py	90.38% <90.38%> (ø)
singer_sdk/sinks/core.py	80.13% <90.90%> (+1.39%)	⬆️
singer_sdk/streams/core.py	83.25% <92.06%> (+1.87%)	⬆️
singer_sdk/helpers/_singer.py	96.59% <100.00%> (+0.17%)	⬆️
singer_sdk/target_base.py	85.37% <100.00%> (+0.35%)	⬆️
singer_sdk/streams/rest.py	83.87% <0.00%> (+1.29%)	⬆️

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[edgarrmondragon]

@kgpayne @aaronsteers this is ready for final (🤞) review 😄

[aaronsteers]

@edgarrmondragon - I made two small tweaks in the docs page. For my part, I think this is ready to go. Fantastic work! 🚀

[edgarrmondragon]

@aaronsteers target now extracts storage root from absolute URLs presented in the manifest array: bf06a9c

• Moved all the batch helpers to singer_sdk.helpers._batch to reduce clutter in singer_sdk.helpers._singer
• Storage object can now be built from a file URL

[aaronsteers]

@edgarrmondragon - A few docs tweaks proposed. Nothing here is blocking but hopefully these small tweaks increase clarity overall.

[aaronsteers]

@edgarrmondragon - Thanks very much for the work to pass and accept absolute paths. I proposed a few docs updates. Feel free to merge when ready, per mine and @cjohnhanson's approval here on the PR.