[v3] implement tool package support with validation and config

[crazywhalecc]

What does this PR do?

Notes:

1. SPC currently cannot distinguish between build dependencies and actual library dependencies; categorizing tools separately helps clarify responsibilities.
2. This proposal serves as an alternative to [v3] artifact: separate extract and install step #1169. Furthermore, completely separating the "extract" and "install" phases does not seem particularly beneficial at this stage.
3. This PR currently only declares interfaces, implementations, and classes without refactoring the actual packages; these will be addressed in another PR once the proposed approach is approved.

tool-config.yml

nasm:
  type: tool
  tool:
    provides: [nasm.exe]
    binary-subdir: ''

Checklist before merging

• If you modified *.php or *.yml, run them locally to ensure your changes are valid:
  • composer cs-fix
  • composer analyse
  • composer test
  • bin/spc dev:lint-config

[henderkes]

Oops, swallowed my comment: seems to do everything I need it to do for the llvm packages. For compiler-rt I'll need to look, maybe need to be able to add runtime hooks.