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Upgrade to Scala 3.7.0-RC1 #4745
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    | Basically all tests pass now, so we can count this as done until 3.7.0 final is out | 
    
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Small adjustments to bring them into line with vanilla `.scala` file semantics, and other cleanups, backported from com-lihaoyi#4745
      
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| Superseded by #5075 | 
  
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Fixes #4609 and #4733
Apart from just bumping the Scala version, this PR overhauls the Mill codegen to take advantage of scala/improvement-proposals#100. This lets us remove a whole bunch of hacks we were previously using to avoid needing the
.packageprefix: alias imports, exports, codegen renames, etc. which are now all unnecessary.All the codegen-related example tests in
./mill 'example.large.multi[_].local.server'pass, so it seems to work. Only hitting some issues with the-experimentalflag stopping us from rolling this out more broadlyUpstream issues
CheckUnusedon Mill repo after updating to Scala 3.7.0-RC1 when-Wunused:allis enabled scala/scala3#22829"-language:experimental.packageObjectValues"compiler flag seems to be missing scala/scala3#22830error overriding method may not override non-experimental memberscala/scala3#22831This PR is just for early testing, once 3.7.0-final is out we can update the PR target that before merging it