fix(estree): Align TSMappedType fields

[leaysgur]

Part of #9705

In this PR, I've tried to align TSMappedType with TS-ESLint.

https://github.com/typescript-eslint/typescript-eslint/blob/main/packages/ast-spec/src/type/TSMappedType/spec.ts

// BEFORE
{
  type: "TSMappedType",
  typeParameter: {
    name: Identifier,
    constraint: TypeNode,
  },
  // ...
}

// AFTER
{
  type: "TSMappedType",  
  key: Identifier,
  constraint: TypeNode,
  // ...
}

And also fixed serializer for optional and readonly types.

They are defined as boolean | '+' | '-' | undefined, but we use true | '+' | '-' | null.

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #10392 will not alter performance

_{Comparing fix/mapped-type (307f87d) with main (50fd839)}

Summary

✅ 36 untouched benchmarks

[overlookmotel]

This PR is marked as draft, so I've not reviewed yet. Please let me know when it's ready for review.

[leaysgur]

Thank you for your concern! 🙏🏻
There are a couple of points I would like to confirm..., but I had no time to put them together. I will let you know soon!

[leaysgur]

@overlookmotel Thank you for your patience each time~, please take a look?

[overlookmotel]

Looks good! All my comments are just nits.

[overlookmotel]

@overlookmotel Thank you for your patience each time~, please take a look?

No no no! Thank you for doggedly pursuing this effort. Really appreciate it.

[overlookmotel]

I realized we're in completely different time zones, and I didn't want for this PR to end up with merge conflicts by the time you'd applied changes, and then waited for me to wake up in the morning and merge it. As my change suggestions were all minor nits, I've taken the liberty of making the changes myself, and will merge this as soon as CI passes.

Details in the comments above.

I hope you don't mind. If anything you don't like in the changes I've made, please feel free to say so and revert them!

[overlookmotel]

Now over 80% passing 🎉

[leaysgur]

I realized we're in completely different time zones,

Ah~, indeed! I live in JST(GMT+9) and it is time to start working now. 🫖

I hope you don't mind. If anything you don't like in the changes I've made, please feel free to say so and revert them!

I don't mind at all and would rather thank you for doing it instead.

Now over 80% passing 🎉

🥳