This commit bundles the Critters library to ensure compatibility with Nodeless environments. Additionally, all licenses for bundled libraries, including Critters, are now included in the package. This helps maintain compliance with open-source license requirements.

This refactor adds a workaround to enable TypeScript declaration merging for the Critters class. We initially tried using interface merging on the default-exported Critters class:

```typescript
interface Critters {
  embedLinkedStylesheet(link: PartialHTMLElement, document: PartialDocument): Promise<unknown>;
}
```

However, since Critters is exported as a default class, TypeScript's declaration merging does not apply. To solve this, we introduced a new class, CrittersBase, which extends Critters, and added the required method in the CrittersBase interface:

```typescript
interface CrittersBase {
  embedLinkedStylesheet(link: PartialHTMLElement, document: PartialDocument): Promise<unknown>;
}
class CrittersBase extends Critters {}
```

- Implemented functionality to compare and update third-party license files
- Added handling for '--accept' argument to update the golden license file
- Included tests to ensure the Critters license file matches the golden reference

This update ensures license file consistency and provides an easy way to update the reference file when necessary.

Leverage the built-in `diff_test` feature from Bazel to check for file changes. For details, see: https://github.com/bazelbuild/bazel-skylib/blob/main/docs/diff_test_doc.md