feat: use runtime alias strategy

[cmoog]

The existing shell init strategy lends itself to frequent state errors as VSCode sessions start and stop. It also carries the limitation of having to restart the shell after you start the VSCode session.

Executing the code_connect.py script before every call to code ensures that the proper socket is detected without fail. The latency drawback is nearly imperceivable, clocking in between 30-60 ms.

With this approach, we can do away with activate.sh and activate.fish... instead all we need is a simple alias like so

function code
  ~/.local/share/code-connect/code_connect.py $argv
end

[cmoog]

Obviously, this would have broader implications for theREADME.md as well as https://github.com/chvolkmann/code-connect-fish-plugin. @chvolkmann let me know if this is something you're open to merging into your mainline.

[chvolkmann]

Looks good so far! Had the plan to implement the validity check before every code call somewhere in the future, so I really appreciate the pull request!

Can you make sure to enable edit permissions to the PR once it's ready? Couldn't mark the previous PR as merged.

[cmoog]

Hopefully the permissions issue is fixed now.

[chvolkmann]

I've unclutted main() a bit and updated the README's usage instructions. Both bash and fish support

alias code="/path/to/code_connect.py"

Thanks again for your contribution, I really appreciate it 🥳