fix: respect {} in safe typestring splitting

[nornagon]

This allows constructions such as:

### `foo(bar)`

* `bar` Function<{type: 'a'} | { type: 'b', extraThing? 'c' }>

[MarshallOfSound]

Can you add a test for what this is supposed to support, I'm not sure how this achieves what you put in the PR body

[nornagon]

@MarshallOfSound test added. This PR makes commas inside of a {} pair part of the type itself, instead of splitting when it encounters a , inside {}.

Before, Function<{foo: A, bar: B}> would parse as a function type with two arguments, of type {foo: A and bar: B}. Now, it parses as a function type with one argument, of type {foo: A, bar: B}.

[electron-bot]

🎉 This PR is included in version 0.10.1 🎉

The release is available on:

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

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