Test js-debug names support

[connor4312]

Refs: #12066

• anyOS @weinand
• anyOS @bamurtaugh

Complexity: 3

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Identifiers in JavaScript can be renamed during compilation. We now support dealing with these renames, provided the tool emits them correctly:

0. Use nightly (stable coming in a day or two)
1. Compile or minify some code that can rename and remap names (you can check this since there should be a non-empty "names" array in the sourcemap). Terser is one tool that works, here's an example of a command for it.
2. Debug it. You should be able to use renamed variables by the original name in:
   • The variables view (it should show variables' original name), including the "copy" context menu action
   • The Watch view
   • The Debug Console/repl

There are some caveats:

• If you test with a minifier, these will often reuse renames between scope. We don't deal with this.
• This is not supported in breakpoint conditions or logpoints (since we don't statically know what scope they will be hit in until it happens)

[weinand]

@connor4312 js-debug's support for "name" mapping is very cool!

And it works for hovers and inline values too: