url: make URLSearchParams properties spec-compliant

[TimothyGu]

Define URLSearchParams methods as enumerable, writable, configurable, as have already been done to URL in #10408. Also adjust the @@toStringTag variable, as done to URL in #10906.

Fixes: #10799

Benchmark (no significant differences)

                                                              improvement confidence   p.value
 url/url-searchparams-parse.js n=100000 type="encodelast"          0.96 %            0.5252137
 url/url-searchparams-parse.js n=100000 type="encodemany"         -1.82 %            0.1068003
 url/url-searchparams-parse.js n=100000 type="manypairs"          -0.32 %            0.5695471
 url/url-searchparams-parse.js n=100000 type="multicharsep"       -0.65 %            0.4697857
 url/url-searchparams-parse.js n=100000 type="multivalue"         -1.08 %            0.4232083
 url/url-searchparams-parse.js n=100000 type="multivaluemany"     -1.11 %            0.1315487
 url/url-searchparams-parse.js n=100000 type="noencode"            0.19 %            0.8053736

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Affected core subsystem(s)

url

[TimothyGu]

CI: https://ci.nodejs.org/job/node-test-pull-request/6088/

[jasnell]

LGTM with green CI

[TimothyGu]

CI: https://ci.nodejs.org/job/node-test-pull-request/6107/

[TimothyGu]

@joyeecheung, just requested a review from you as you are the author of #10408

[joyeecheung]

I'm wondering if there is a possibility/necessity to generate these stuff from an IDL file, like what browsers do, if there will be more convergence with Web APIs in Node core (console, crypto, streams, etc.) Not that this is what this PR should deal with though(and this is just to mitigate func-name-matching anyway, not full-on generation), just a thought.

Also the name is a little bit too general, could be something like defineIDLData or defineIDLValues, since it's about properties that need to be defined with value.

[jasnell]

That would likely be a bit overkill at the moment. This is the only IDL defined API we have currently. Eventually if we go down that road more then we can consider this.

[joyeecheung]

Would be easier to read if s/key/symbol/, or just separate the two mixins(take operations and symbols as arguments instead of one obj)

[jasnell]

Landed in 90c2ac7