Add JSON pre-processor

[RobinMalfait]

This PR adds a small JSON pre processor to improve parsing JSON files. This is because the extractor creates "sub machines" whenever it encounters a [ or a { in the input. We do this because of things like %w[…] strings in Ruby or className={clsx({flex: true})} in JSX.

Due to the sheer amount of potential [ and ] brackets, it could be that parsing JSON files are way slower than they need to be.

To tackle this, after this PR, when given an input like this:

[1,[2,[3,4,["flex flex-1 content-['hello_world']"]]], {"flex": true}] 

We'll preprocess all the important brackets and braces by replacing them with spaces so the extractor doesn't need special casing:

1, 2, 3,4, "flex flex-1 content-['hello_world']" , "flex": true 

We saw this while debugging this issue: #17092

Test plan

1. Added test to verify the pre processing works
2. Existing tests still pass