feat(vite): add marko file extensions

[DylanPiercey]

Description

A Marko vite plugin is in the works however it is blocked by a couple hard coded file extension checks.

This PR adds support for the .marko file extension which makes creating a plugin possible.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

On the test front it is a bit tricky. I could create an example in the playground repo, but it's a bit of a chicken and egg situation with the @marko/vite plugin not yet being published.

[DylanPiercey]

Thanks all for getting this through so quickly.
Happy to release our official Marko plugin! https://github.com/marko-js/vite

[patak-dev]

That is awesome @DylanPiercey! It would be great if you could join our Discord server if you are not already there so you can share the plugin

[DylanPiercey]

Good call @patak-js. For some reason I though I was already a part of that server, apparently not! Joining now 😄