feat(twoslash-svelte): markup cutting

[Hugos68]

This PR adds the possibility to do cuts like // ---cut-before--- but inside markup using HTML style comments:

<!-- ---cut-start--- -->
<script>
    let count = $state(0);
    
    function increment() {
        count++;
    }

</script>
<!-- ---cut-end--- -->

<button onclick={increment}>
    Count is: {count}
</button>

Outputs:

{
  "code": "\n<button onclick={increment}>\n    Count is: {count}\n</button>",
  "nodes": [
    {
      "type": "hover",
      "text": "(local function) increment(): void",
      "start": 18,
      "length": 9,
      "target": "increment",
      "line": 1,
      "character": 17
    },
    {
      "type": "hover",
      "text": "let count: number",
      "start": 45,
      "length": 5,
      "target": "count",
      "line": 2,
      "character": 15
    }
  ],
  "flags": []
}

This is useful for example on the Svelte docsite where this will be implemented to cut out bloated scripts that setup some javascript to showcase markup functionality while still being able to typecheck and twoslash those.

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[codecov]

Codecov Report

❌ Patch coverage is 93.61702% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.57%. Comparing base (f86ad13) to head (001f53e).

Files with missing lines	Patch %	Lines
packages/twoslash-svelte/src/index.ts	90.32%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
+ Coverage   90.50%   90.57%   +0.07%     
==========================================
  Files          17       17              
  Lines        1043     1072      +29     
  Branches      333      352      +19     
==========================================
+ Hits          944      971      +27     
- Misses         93       95       +2     
  Partials        6        6              

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[antfu]

Thanks!