feat: make RequestEvent readonly instead of frozen

[DustinJSilk]

What is it?

• Feature
• types

Description

Switch from freezing RequestEvents to using readonly so that users can extend the RequestEvent while keeping the event safe from malpractice internally.

Checklist

• My code follows the developer guidelines of this project
• I performed a self-review of my own code
• I added a changeset with pnpm change
• I made corresponding changes to the Qwik docs
• I added new tests to cover the fix / functionality

[changeset-bot]

🦋 Changeset detected

Latest commit: 1db1a0b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@builder.io/qwik-city	Patch
eslint-plugin-qwik	Patch
@builder.io/qwik	Patch
create-qwik	Patch
@builder.io/qwik-react	Patch

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npm i https://pkg.pr.new/@builder.io/qwik@8135

npm i https://pkg.pr.new/@builder.io/qwik-city@8135

npm i https://pkg.pr.new/eslint-plugin-qwik@8135

npm i https://pkg.pr.new/create-qwik@8135

commit: 1db1a0b

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Name	Status	Preview	Last Commit
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[wmertens]

[wmertens]

We'll discuss this in next week's core meeting but looks good