[RFC] Rename this repo to rustac, update ecosystem accordingly

[gadomski]

Right now our two main repos are stac-rs (Rust crates) and stacrs (Python package). There's some obvious problems:

• It's not clear, at first glance, why stacrs is a Python package
• It's not clear which repo to open an issue on if you're having a problem
• It's not clear what a new repo w/ bindings to another language (e.g. R) should be named

During Development Seed team week 2025, we whiteboarded the idea of a rename to rustac:

Advantages

• Clear, memorable name
• Still has *stac* in the name to indicate what it's for
• Scales to other languages:
  • rustac-py: Python
  • rustac-r: R
  • ...?
• Vibes with "rustic", which brings to mind a cabin and maybe a whisky

Disadvantages

• We already have mind share around stacrs
• Renames are annoying for both maintainers and users

Open questions

If we decide to implement:

• When do we do it?
• Do we restart version numbers? (@gadomski thinks no)
• What packages do we actually rename?
  • Rust: keep as stac, stac-api, etc
  • Python: We do want to move to rustac

Actions

#653

[wildintellect]

Renumbering - No

Python and R, etc - I think the repo names will be rustac-r and rustac-py, so they sort alphabetically together, but the package names in those langs should just be rustac. (which is similar to what polars/r-polars does)