feat: support spaces before cut comments

[sapphi-red]

Currently twoslash requires the cut comment to be at the beginning of the line. If I wanted to cut out the type comment for a variable in a function, I have to write it like below.

function foo() {
  const x = "123"
// ---cut-start---
  /** @type {"345"} */
// ---cut-end---
  const b = "345"
}

But if that project uses prettier, it will be formatted and the comments will have a space before the // like below.

function foo() {
  const x = "123"
  // ---cut-start---
  /** @type {"345"} */
  // ---cut-end---
  const b = "345"
}

So I'll have to disable prettier for this part of the code (https://github.com/vitejs/vite/blob/48a2bbb9994f9cd67e3d7455a57f6579f64e784d/docs/config/build-options.md?plain=1#L51-L66).

This PR allows the cut comment to have space characters before.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.25%. Comparing base (249c9d7) to head (7a53d31).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #33 +/- ## ======================================= Coverage 95.25% 95.25% ======================================= Files 16 16 Lines 1982 1982 Branches 347 347 ======================================= Hits 1888 1888 Misses 94 94 ```

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