PRO-6775: External frontend support, bugfix, debug mode

[myovchev]

Summary

• Adds module debug logs when in asset debug mode (APOS_ASSETS_DEBUG=1).
• Adds an option for disabling the module preload polyfill.
• Adds support for synthetic entrypoints, that will only process the entrypoint prologue.
• Don't crash when there is no entrypoint of type index.

What are the specific steps to test this change?

What kind of change does this PR introduce?

(Check at least one)

• Bug fix
• New feature
• Refactor
• Documentation
• Build-related changes
• Other

Make sure the PR fulfills these requirements:

• It includes a) the existing issue ID being resolved, b) a convincing reason for adding this feature, or c) a clear description of the bug it resolves
• The changelog is updated
• Related documentation has been updated
• Related tests have been updated

If adding a new feature without an already open issue, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

[linear]

PRO-6775 Update all of our Starter Kits to include Vite and ESM

[haroun]

Is this explained in our official documentation?

[myovchev]

No, this should be addressed by Bob on the release data (by the Changelog entries)

[myovchev]

It's also a core option, that has an entry in the core CHANGELOG.