feat: inline comment tag

[jg-rp]

This pull request implements the inline comment tag, as found in Ruby Liquid version 5.4.0. At the time of writing, Ruby Liquid version 5.4.0 is "unreleased", but inline comments are already available in Shopify store templates.

Inline comments look like this:

{% # This is a comment %}
{%-
  # Comments can span multiple lines,
  # but every line must start with a hash.
-%}

And inside liquid tags:

{% liquid
  # This is a comment
  echo "Hello"
%}

You might also be interested in this modified Prism language definition for Liquid.

[coveralls]

Pull Request Test Coverage Report for Build 2605659606

• 10 of 10 (100.0%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 2601600709:	0.0%
Covered Lines:	2101
Relevant Lines:	2101

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💛 - Coveralls

[harttle]

We'll need to add docs for this tag and website sidebar. I can help update the zh-cn translation.

[jg-rp]

We'll need to add docs for this tag and website sidebar. I can help update the zh-cn translation.

I'll have a go at docs for this tag within the next day or two.

[github-actions]

🎉 This PR is included in version 9.38.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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