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 PureScript support into an extension and removes the
built-in PureScript support from Zed.
Release Notes:
- Removed built-in support for PureScript, in favor of making it
available as an extension. The PureScript extension will be suggested
for download when you open a `.purs` file.
