This PR updates the `zed_extension_api` to v0.1.0 for the extensions
that live in this repo.
The changes in that version of additive, so none of the extensions need
to change their usage in order to upgrade.
Release Notes:
- N/A
This PR extracts Erlang support into an extension and removes the
built-in Erlang support from Zed.
Tested using a Nix shell:
```
nix-shell -p erlang-ls
```
Release Notes:
- Removed built-in support for Erlang, in favor of making it available
as an extension. The Erlang extension will be suggested for download
when you open a `.erl` or `.hrl` file.
