Feature: add support for configuration files to control how declarati…

[msprotz]

…ons are grouped within various C files

Example:

files:
  - name: libcrux_digest
    api:
      - [ libcrux, digest ]
  - name: libcrux_platform
    api:
      - [ libcrux_platform ]
  - name: libcrux_kyber
    api:
      - [ libcrux_kyber, kyber768 ]
    private:
      - [ libcrux_kyber, "*" ]
  - name: core
    private:
      - [ core, "*" ]

will be merged later once I figure out how to add a nix dependency on the new opam package, and once I document the code a little bit