Rewrite API so that Scala 3 would not rely on AutoDerived pattern (Scala 3.7 givens resolution change)

[MateuszKubuszok]

This PR solves the issue caused by 3.7 givens resolution change:

• it no longer relies on this pattern

  trait TypeClass[A] extends TypeClass.AutoDerived[A]
  object TypeClass {
    trait AutoDerived[A]
    object AutoDerived {
      // summons TypeClass but NOT TypeClass.AutoDerived
      inline given [A]: AutoDerived[A] = ...
    } 
  }
  extension [A](value: A) def foo(using TypeClass.AutoDerived[A]) = ...

  for recursive (semi)automatic derivation

• it uses new Expr.summonIgnoring

  trait TypeClass[A]
  object TypeClass {
    inline given derived[A]: AutoDerived[A] =
      ${ macroUsingSimmonIgnoring[A] }
      // Inside it uses:
      // Expr.summonIgnoring[TypeClass[A]](
      //  Symbol.classSymbol("TypeClass").companionModule.methodMember("derived")*
      // )
      // instead of Expr.summon[TypeClass[A]]
  }
  extension [A](value: A) def foo(using TypeClass[A]) = ...

---

• remove AutoDerived on Scala 3
• use summonIgnoring on Scala 3
• fix failing tests
  • fix Type.prettyPrint on Scala 3 for internal classes (now they have _ prefix)
  • remove auto/syntax/inline on Scala 3 (they no longer make sense) and make their tests Scala 2-only
  • tests on Scala.js are failing due to Running tests with munit and Scala.js breaks for Scala 3.7 scala/scala3#22794 - unblocked
• fix warnings and re-enable Xfatal-errors on Scala 3
  • currently warnings are disabled because of https://github.com/scala/scala3/
    issues/22812 - unblocked
  • fix warnings on chimney
  • fix warnings on chimney-cats
  • fix warnings on chimney-java-collections
  • fix warnings on chimney-protobufs
• update documentation (differences between Scala 2 and 3 in 2.0.0)
  • update documentation on master to explain issues with 3.7 and provide a workaround (into.transform instead of transformInto, or using macros seems to work!)

[codecov]

Codecov Report

Attention: Patch coverage is 86.48649% with 20 lines in your changes missing coverage. Please review.

Project coverage is 86.98%. Comparing base (9862bb2) to head (628b442).
Report is 63 commits behind head on 2.0.0-development.

Files with missing lines	Patch %	Lines
...ey/internal/compiletime/ChimneyTypesPlatform.scala	44.44%	5 Missing ⚠️
...ey/internal/compiletime/ChimneyTypesPlatform.scala	50.00%	3 Missing ⚠️
...er/rules/TransformProductToProductRuleModule.scala	25.00%	3 Missing ⚠️
...mney/protobufs/ProtobufsTransformerImplicits.scala	91.30%	2 Missing ⚠️
...ime/derivation/transformer/ImplicitSummoning.scala	0.00%	2 Missing ⚠️
...rmSealedHierarchyToSealedHierarchyRuleModule.scala	33.33%	2 Missing ⚠️
...himney/internal/compiletime/DerivationResult.scala	0.00%	1 Missing ⚠️
...iletime/derivation/patcher/ImplicitSummoning.scala	0.00%	1 Missing ⚠️
...letime/derivation/transformer/Configurations.scala	80.00%	1 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           2.0.0-development     #713      +/-   ##
=====================================================
- Coverage              87.10%   86.98%   -0.12%     
=====================================================
  Files                    154      157       +3     
  Lines                   7016     6748     -268     
  Branches                 727      651      -76     
=====================================================
- Hits                    6111     5870     -241     
+ Misses                   905      878      -27     

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[ghostdogpr]

Shouldn't this be PartialTransformer[From, To]?

[MateuszKubuszok]

Well, yes, it should