feat(console): print proxy details

[uki00a]

Fixes #7096.

Changes

• Add Deno.core.getProxyDetails to get details of Proxy.
• Make proxy objects to be properly stringified as follows:

$ ./target/debug/deno
Deno 1.3.0
exit using ctrl+d or close()
> new Proxy([1,2,3], { get() {} })
Proxy [ [ 1, 2, 3 ], { get: [Function: get] } ]
> new Proxy({ a: 1, b: "hello" }, { get() {} })
Proxy [ { a: 1, b: "hello" }, { get: [Function: get] } ]

[bartlomieju]

@nayeemrmn please review

[nayeemrmn]

Nice. Node only does this when the showProxy option is given. Our defaults should match Node so to support this we have to add InspectOptions::showProxy. That means 1.4.0.

[nayeemrmn]

Also add showProxy: false to DEFAULT_INSPECT_OPTIONS.

[nayeemrmn]

LGTM (1.4.0)

[bartlomieju]

LGTM, thanks @uki00a

[uki00a]

@nayeemrmn @bartlomieju Thanks!