WIP: Add tk

[IsabelParedes]

[DerThorsten]

@IsabelParedes are we sure this is a thing buildable & usable from wasm? this seems like a widget library, ie some UI stuff. The dependencies below do not look like this will fly with emscripten. also FYI, the selectors work different with the new rattler recipes ( see the if clause in https://github.com/prefix-dev/rattler-build?tab=readme-ov-file#the-recipe-format)

    - ${{ compiler('c') }}
    - ${{ cdt('xorg-x11-proto-devel') }}  # [linux]
    - ${{ cdt('libx11-devel') }}          # [linux]
    - ${{ cdt('libxcb') }}                # [linux]
    - ${{ cdt('libxau') }}                # [linux]
    - make                               # [linux]
    - ${{ cdt('freetype-devel') }}        # [linux and tk_variant == 'xft']
    - ${{ cdt('fontconfig-devel') }}      # [linux and tk_variant == 'xft']
    - ${{ cdt('libXrender-devel') }}      # [linux and tk_variant == 'xft']
    - ${{ cdt('libXft-devel') }}          # [linux and tk_variant == 'xft']
    - pkg-config                         # [linux and tk_variant == 'xft']

[IsabelParedes]

this seems like a widget library, ie some UI stuff.

Closing this since we probably don't want to create GUI applications with R.