rfc: add a "devcontainer" setup

[hdonnay]

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This is a little proof-of-concept for a devcontainer.

My workflow (neovim and a mess of terminals) doesn't really integrate with devcontainers the way VS Code does, so I ended up building this such that it's usable as a toolbx image.

To try:

podman build -t devcontainer-claircore:latest .
toolbox create -i devcontainer-claircore:latest claircore-dev
toolbox enter claircore-dev

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 55.77%. Comparing base (395b041) to head (a0d1342). Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1299   +/-   ##
=======================================
  Coverage   55.77%   55.77%           
=======================================
  Files         265      265           
  Lines       16557    16557           
=======================================
  Hits         9235     9235           
  Misses       6362     6362           
  Partials      960      960           

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