Adopt LF version/feature generation to repo shuffle

[roger-bosman-da]

As LF is moving to canton, we need to update our LF version/feature generation that as of writing depens on json generated from daml-lf.bzl. The steps are as follows:

1. Check in scala generated files (i.e. LanguageVersionGen and LanguageFeatureGen.scala), keep daml-lf.bzl around
2. Check in the json somewhere in canton and adapt the canton generation logic to sbt
3. Work on getting that file in daml
4. Adopt hs generation logic if needed
5. Move away from daml-lf.bzl on a bazel level by looking at the json instead

See https://github.com/DACH-NY/canton/issues/29660 for the canton-side issue