Auto merge of #163306 - khyperia:gca-rename, r=BoxyUwU

rename GCA features

fixes https://github.com/rust-lang/project-const-generics/issues/114

We would like to publish posts soon that GCE is dying and GCA is the future. As part of that, we want the feature gates/etc. to be in their final-ish shape. We discussed a lot of naming bikesheds in the zulip thread [#project-const-generics > talkies at last @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/260443-project-const-generics/topic/talkies.20at.20last/near/620368825), namely:

- `min_generic_const_args` -> `gca_min_const_items`
- `generic_const_args` -> `gca_const_items`
- `macroless_generic_const_args` -> `gca_macroless_args`
- `macroless_const_item_generic_const_args` -> `gca_macroless_items`

things that were discussed in that Zulip thread, but are not part of this PR:

- `gca_adts` and/or `gca_arrays` (the feature is not created yet)
  - the `DirectConstArgContext` enum is in a vaguely awkwardly named spot after this PR. I intend to clean it up as part of creating the `gca_adts` feature (perhaps turning it into a bitflags for allowed syntax, or something)
- renaming the `direct_const_arg!` macro to `gca!` - this was done in https://github.com/rust-lang/rust/pull/163198
- deleting `type const`, introducing `#[always_gca]` - this was done in https://github.com/rust-lang/rust/pull/162517

r? @BoxyUwU
tree: 6d29b6f4aa932f03fc0ec63797fdad914e0636e7
  1. .github/
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  3. library/
  4. LICENSES/
  5. src/
  6. tests/
  7. .clang-format
  8. .editorconfig
  9. .git-blame-ignore-revs
  10. .gitattributes
  11. .gitignore
  12. .gitmodules
  13. .ignore
  14. .mailmap
  15. AGENTS.md
  16. bootstrap.example.toml
  17. Cargo.lock
  18. Cargo.toml
  19. CLAUDE.md
  20. CODE_OF_CONDUCT.md
  21. configure
  22. CONTRIBUTING.md
  23. COPYRIGHT
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  25. LICENSE-APACHE
  26. license-metadata.json
  27. LICENSE-MIT
  28. package.json
  29. README.md
  30. RELEASES.md
  31. REUSE.toml
  32. rust-bors.toml
  33. rustfmt.toml
  34. triagebot.toml
  35. typos.toml
  36. x
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  38. x.py
  39. yarn.lock
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