fix: show all enums on hover

[twelvelabs]

What does this PR do?

This PR updates the hover service to display all possible enum values, rather than just the currently selected one. Additionally, it will display the enums regardless of whether the schema contains explicit descriptions (though it will continue to display the descriptions if present - see included test case).

Also:

• Included a minor change to how examples are displayed (i.e. added markdown bullets) to make them visually consistent with the enums.
• Added a ensureLineBreak helper to make sure there is consistent spacing between each of the various hover sections.

What issues does this PR fix or reference?

Fixes #941

Is it tested? How?

• Tested locally with https://github.com/twelvelabs/stamp/blob/main/docs/stamp.schema.json
• See test cases in test/hover.test.ts

[twelvelabs]

cc @gorkem and @msivasubramaniaan for visibility.

[coveralls]

coverage: 84.071% (+0.3%) from 83.813%
when pulling f73cc82 on twelvelabs:enums-on-hover
into ed03cbf on redhat-developer:main.

[msivasubramaniaan]

LGTM

Thanks @twelvelabs for your contribution

[signaledge]

@msivasubramaniaan @twelvelabs This feature really broke our workflow, we use arrays where items are defined with a huge list of enums (and markdownEnumDescriptions), and now hover will not work as it tries to render the full list of enum instead of trying to show the markdownEnumDescription for the enum entry being hovered on first. I also think this feature has limited purpose as the list is available with autocompletion. I suggest to put this change behind a setting which can be disabled.