Establish Spark 3.x & Scala 2.13 cross publish

[pomadchin]

TODO:

• check that 3.2.0 version would still properly work with Spark 3.1.x, is it even possible or we would delay this PR merge due to compatability reasons. incompatible , see Establish Spark 3.x & Scala 2.13 cross publish #573 (comment) (it was expected but still worth checking)
• Cross publish projects for different Spark versions
• Drop irrec-regex-gen test dependency
• Scala 2.13 cross build
• Green CI
• Drop sbt-github-actions (we have a bit more complicated release process now)
• Scala 2.13 / 2.12 cross publish
• Updated docs

This PR slightly changes the release process:

• By default, frameless artifacts depend on the most recent Spark version
• Suffix -spark-{major}{minor} is added to artifacts that are released for the previous Spark version(s).

Artifact names examples:

• frameless-dataset (the latest Spark dependency)
• frameless-dataset-spark31 (Spark 3.1.x dependency)
• frameless-dataset-spark30 (Spark 3.0.x dependency)

Closes #554
Closes #570
Closes #553

[codecov]

Codecov Report

Merging #573 (a14d99a) into master (8b18af2) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #573      +/-   ##
==========================================
+ Coverage   95.13%   95.14%   +0.01%     
==========================================
  Files          65       65              
  Lines        1131     1134       +3     
  Branches       11        5       -6     
==========================================
+ Hits         1076     1079       +3     
  Misses         55       55              

Flag	Coverage Δ
2.12.15	95.14% <100.00%> (+0.01%)	⬆️
2.13.6	96.39% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...scala/frameless/functions/AggregateFunctions.scala	100.00% <ø> (ø)
...taset/src/main/scala/frameless/functions/Lit.scala	94.44% <ø> (ø)
...t/src/main/scala/frameless/functions/package.scala	100.00% <ø> (ø)
...et/src/main/scala/frameless/ops/SmartProject.scala	100.00% <ø> (ø)
cats/src/main/scala/frameless/cats/implicits.scala	73.91% <100.00%> (ø)
dataset/src/main/scala/frameless/TypedColumn.scala	100.00% <100.00%> (ø)
...ataset/src/main/scala/frameless/TypedDataset.scala	100.00% <100.00%> (ø)
...c/main/scala/frameless/TypedDatasetForwarded.scala	74.28% <100.00%> (ø)
...la/frameless/functions/NonAggregateFunctions.scala	100.00% <100.00%> (ø)
...taset/src/main/scala/frameless/functions/Udf.scala	87.23% <100.00%> (+0.27%)	⬆️
... and 2 more

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[pomadchin]

@cchantep what are your thoughts about merging this one? I would like to suggest to cut a release with 3.1.x in deps before merging this in.

[cchantep]

As-is it would break compatibility (e.g. functions.{shiftrightunsigned,bitwise_not}), so unless a cross-version build is set up, I won't merge that.

[pomadchin]

@cchantep bf27a12 makes the code source compatible with 3.1.x, is it enough for you or you want to establish 3.1 / 3.2 cross version releases as well?

[pomadchin]

Merging! Let's see how the snapshot deployment goes (hopefully well!)