scalac:3.x does not support -print-tasty flag

The official GitHub hosted Scala 3 `scalac` script for versions `3.0.0` and higher scans the flags to pick which main class to run, for example:
- `scalac -print-tasty` is meant to run `dotty.tools.dotc.config.TastyPrinter`,
- `scalac -decompile` is meant to run `dotty.tools.dotc.decompiler.Main`,
- by default run `dotty.tools.dotc.Main`.

This means that the `scalac` bootstrap launcher installed by `cs` does not have feature parity as it always runs `dotty.tools.dotc.Main`.

this impacts the doc page at https://docs.scala-lang.org/scala3/guides/tasty-overview.html#what-is-tasty which recommends to use
```bash
$ scalac -print-tasty hello.tasty
$ scalac -decompile hello.tasty
```

So the solutions are either
1. to publish somewhere a jar with a main class that replicates the `scalac` script
2. to bundle the original bash/bat scripts for the 3.x series. This requires `versionOverrides` to support using prebuilt for one version, and jvm launcher for another

another mitigation is to add the tasty-printer main class to apps

Start by inspecting the coursier/apps configuration for the scalac bootstrap launcher and the versionOverrides handling mentioned in the issue. Compare how Scala 3.x launcher modes select main classes, then determine whether the chosen approach provides working -print-tasty and -decompile commands and preserves the default scalac behavior.

Written by the indexing model from the issue text.