Remove JavaScript realm dependency

[yoshisatoyanagisawa]

To allow the algorithms in the specification to be used outside of JavaScript, we need to remove dependency to JavaScript realm.

This CL make a URLPattern object associated with an underlying URL Pattern struct, and makes algorithms to use it instead.

Fixes https://github.com/whatwg/urlpattern/issues/217

• [x] At least two implementers are interested (and none opposed):
  • Google Chrome
  • n/a (change is simply fixing an issue in a non-controversial way).
• [x] Tests are written and can be reviewed and commented upon at:
  • n/a (this is a fix to how the spec express this, there is no behavior change, and existing tests cover this behavior)
• [x] Implementation bugs are filed:
  • Chromium: n/a (no behavior change is required)
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1731418 (vendor does not yet implement the spec)
  • WebKit: n/a (no reason to believe a change is required)
  • Deno: n/a (no reason to believe a change is required)
  • kenchris/urlpattern-polyfill: n/a (no reason to believe a change is required)
• [x] MDN issue is filed: n/a (change is on a spec detail not expressly documented)
• [x] The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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[yoshisatoyanagisawa]

@jeremyroman @sisidovski @domenic Can I ask you to take a look?

[yoshisatoyanagisawa]

To remove JavaScript realm, you also have to update 4.1. Integrating with JavaScript APIs not to accept realm and build URL Pattern with create?

Yes. I tried to update them to eliminate realm dependencies.

[yoshisatoyanagisawa]

Thanks for the review, @sisidovski.

@jeremyroman @domenic Will you take a look?

[yoshisatoyanagisawa]

@domenic Thanks for the review. I have addressed your comments.

[yoshisatoyanagisawa]

Thanks @jeremyroman for the review. @domenic Will you take another look at the PR?

[yoshisatoyanagisawa]

@domenic Thank you for the review!

Will somebody merge this PR? Thank you in advance.