Allow pre-release updates to specific dependencies

[arixmkii]

Fixes #2634

Added dedicated configuration, which alters pre-release version checks for specified dependencies.

Similar features has been mentioned there https://github.com/scala-steward-org/scala-steward/issues/1023#issuecomment-551942307

[arixmkii]

I plan to update docs, but posting this early here to see if additional changes will be requested.

[codecov[bot]]

Codecov Report

Merging #2635 (5ad59a2) into main (c17d367) will increase coverage by 0.11%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2635      +/-   ##
==========================================
+ Coverage   81.32%   81.44%   +0.11%     
==========================================
  Files         146      146              
  Lines        2592     2608      +16     
  Branches       43       45       +2     
==========================================
+ Hits         2108     2124      +16     
  Misses        484      484              

Impacted Files	Coverage Δ
...ain/scala/org/scalasteward/core/data/Version.scala	100.00% <100.00%> (ø)
...g/scalasteward/core/repoconfig/UpdatesConfig.scala	100.00% <100.00%> (ø)
...scala/org/scalasteward/core/update/FilterAlg.scala	76.92% <100.00%> (+1.92%)	:arrow_up:

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[armanbilge]

👍 does pre-release include snapshots, or just Ms/RCs?

I've fantasized about using this sort of machinery to create a steward-powered, distributed community build.

[arixmkii]

I though it was, but adding more tests it didn't play nice with snapshots. Added support for snapshots and tests in a separate commit.

[arixmkii]

Changes:

• Fixed compatibility with https://github.com/sbt/sbt-dynver versioning scheme for snapshots.
• Updated sample repo config with new feature documentation
• Added new config settings to all config settings test.

[arixmkii]

I can squash commits and rebase if necessary. Kept commits separate to ease the review process.