Add setting to disable inline completions in language scopes (#20508)

This adds a setting to disable inline completions in language scopes to,
for example, disable them in comments or strings.

This setting can be made per language.

Examples:

```json
{
  "languages": {
    "Go": {
      "inline_completions_disabled_in": ["comment", "string"]
    }
  }
}
```

```json
{
  "inline_completions_disabled_in": ["comment"]
}
```

Closes #9133

Release Notes:

- Added language setting to disable inline comments in certain scopes.
Example: `{"languages": {"Go": {"inline_completions_disabled_in":
["comment", "string"]}}}`

Co-authored-by: Bennet <bennet@zed.dev>