Migrate sfpowerscripts artifact to custom setting

[aly76]

Closes Issue #476

• Replaced SfpowerscriptsArtifact__c with SfpowerscriptsArtifact2__c custom setting
• Each record takes up 290 bytes in the app layer cache
• When the custom setting has no records, and the source object has more than one record, records will be migrated to the custom setting
• Max. number of records that can mgirated is 200, using the tree API

[codecov-commenter]

Codecov Report

Merging #545 (3529185) into develop (f39432d) will decrease coverage by 4.06%.
The diff coverage is 11.11%.

@@             Coverage Diff             @@
##           develop     #545      +/-   ##
===========================================
- Coverage    80.01%   75.94%   -4.07%     
===========================================
  Files           38       39       +1     
  Lines         1291     1372      +81     
  Branches       226      248      +22     
===========================================
+ Hits          1033     1042       +9     
- Misses         258      330      +72     

Impacted Files	Coverage Δ
packages/core/src/artifacts/ArtifactMigrator.ts	7.69% <7.69%> (ø)
...src/artifacts/ArtifactInstallationStatusUpdater.ts	100.00% <100.00%> (ø)
...es/core/src/artifacts/InstalledAritfactsFetcher.ts	94.44% <100.00%> (+0.32%)	⬆️

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