Add simple instance-wide PR throttle

[fthomas]

This adds a simple instance-wide PR throttle. It can be activated by adding the --pr-throttle-skip=$duration or --pr-throttle-wait=$duration command-line options. With --pr-throttle-skip=$duration Scala Steward will skip creating PRs for $duration after the last PR. With --pr-throttle-wait=$duration it actively waits until $duration is elapsed before creating the next PR.

Closes #2934, closes #2355

[armanbilge]

Thank you so much! This strategy is easy to understand and will work well for us 👍

[codecov]

Codecov Report

Base: 90.96% // Head: 90.68% // Decreases project coverage by -0.28% ⚠️

Coverage data is based on head (1783dd9) compared to base (ef3cd47).
Patch coverage: 69.44% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2970      +/-   ##
==========================================
- Coverage   90.96%   90.68%   -0.28%     
==========================================
  Files         157      159       +2     
  Lines        3209     3253      +44     
  Branches      242      224      -18     
==========================================
+ Hits         2919     2950      +31     
- Misses        290      303      +13     

Impacted Files	Coverage Δ
...ala/org/scalasteward/core/application/Config.scala	50.00% <ø> (ø)
...org/scalasteward/core/application/StewardAlg.scala	42.85% <0.00%> (+0.43%)	⬆️
...ala/org/scalasteward/core/nurture/NurtureAlg.scala	19.07% <0.00%> (-0.13%)	⬇️
...calasteward/core/nurture/PullRequestThrottle.scala	11.11% <11.11%> (ø)
.../scala/org/scalasteward/core/application/Cli.scala	100.00% <100.00%> (ø)
...la/org/scalasteward/core/application/Context.scala	75.94% <100.00%> (+0.62%)	⬆️
...scala/org/scalasteward/core/util/SimpleTimer.scala	100.00% <100.00%> (ø)
...teward/core/repoconfig/ValidateRepoConfigAlg.scala	85.71% <0.00%> (-14.29%)	⬇️
...org/scalasteward/core/coursier/VersionsCache.scala	85.71% <0.00%> (-4.29%)	⬇️
...ain/scala/org/scalasteward/core/data/Version.scala	100.00% <0.00%> (ø)
... and 4 more

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[barryoneill]

Hi @fthomas - is there any plan to bring this in?