Rename the AnUpdate hierarchy

[alejandrohdezma]

This new ADT was introduced in #2714 for enabling supporting grouping updates, but the naming was not very good. This PR fixes the hierarchy names.

Renames in this PR

• Update.Single => Update.ForArtifactId
• Update.Group => Update.ForGroupId
• Update => Update.Single
• GroupedUpdate => Update.Grouped
• AnUpdate => Update

Functional changes in this PR

Instead of deriving circe's Codec for the whole Update ADT, individual Decoder are created to ensure JSON created using older versions of Scala Steward will still be decoded.

implicit val ForGroupIdDecoder: Decoder[ForGroupId] = {
  val derived = deriveDecoder[ForGroupId]
  derived
    .prepare(_.downField("ForGroupId"))
    .or(derived.prepare(_.downField("Group")))
}

implicit val UpdateEncoder: Encoder[Update] = deriveEncoder

implicit val UpdateDecoder: Decoder[Update] =
    ForArtifactIdDecoder
      .widen[Update]
      .or(ForGroupIdDecoder.widen[Update])
      .or(Decoder[Grouped].widen[Update])

vs

implicit val UpdateCodec: Codec[Update] = deriveCodec

[codecov]

Codecov Report

Base: 80.51% // Head: 80.50% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (e599e8b) compared to base (e185a73).
Patch coverage: 87.75% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2748      +/-   ##
==========================================
- Coverage   80.51%   80.50%   -0.01%     
==========================================
  Files         149      149              
  Lines        2853     2863      +10     
  Branches      191      189       -2     
==========================================
+ Hits         2297     2305       +8     
- Misses        556      558       +2     

Impacted Files	Coverage Δ
...org/scalasteward/core/buildtool/mill/MillAlg.scala	75.00% <ø> (ø)
.../scala/org/scalasteward/core/data/UpdateData.scala	50.00% <ø> (ø)
...ain/scala/org/scalasteward/core/edit/EditAlg.scala	94.59% <ø> (ø)
...scala/org/scalasteward/core/edit/EditAttempt.scala	100.00% <ø> (ø)
...rg/scalasteward/core/edit/hooks/HookExecutor.scala	94.36% <ø> (ø)
.../scalasteward/core/edit/hooks/PostUpdateHook.scala	100.00% <ø> (ø)
.../core/edit/scalafix/ScalafixMigrationsFinder.scala	100.00% <ø> (ø)
...in/scala/org/scalasteward/core/git/CommitMsg.scala	100.00% <ø> (ø)
.../main/scala/org/scalasteward/core/io/package.scala	100.00% <ø> (ø)
...ala/org/scalasteward/core/nurture/NurtureAlg.scala	0.00% <0.00%> (ø)
... and 18 more

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[alejandrohdezma]

@fthomas can we instruct Codacy here to ignore the _1/_2 usages on tuples? I don't think I have permission in Codacy to do so

[exoego]

Sorry for late response.
I was trying to find better naming/hierarchy for those Update-classes, but ended in smoke.

For this PR, findings by CodeCov and Codacy are trivial and negligible, I think.