This PR makes the extension CLI populate the grammars in the manifest
from the contents of the `grammars` directory for legacy extensions
using the `extension.json` format (`schema_version == 0`).
This allows us to continue packaging these older extensions until they
can be migrated to the new schema version.
Release Notes:
- N/A
This PR fixes an issue where the extension CLI would error if a
`Cargo.toml` didn't exist when we were trying to check for its
existence. Since we're just checking if it exists for the purposes of
detecting a Rust extension, we can safely ignore the errors.
Also improved the logging/error handling in a few spots to make other
errors easier to troubleshoot in the future.
Release Notes:
- N/A
This will be used in the
[extensions](https://github.com/zed-industries/extensions) repository
for packaging the extensions that users submit.
Release Notes:
- N/A
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Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
