Add undocumented param to contacts API endpoint which allows URNs to be expanded

[rowanseymour]

Without param...

"urns": ["tel:+250700009999", "twitterid:357475478548745"]

With param...

"urns": [
    {
        "channel": {
            "uuid": "c9a5d98a-4c89-4f25-af96-81f06b67e019",
            "name": "Vonage"
        },
        "scheme": "tel",
        "path": "+250700009999",
        "display": null
    },
    {
        "channel": null,
        "scheme": "twitterid",
        "path": "357475478548745",
        "display": "cathy"
    }
]

Without param in anon org...

"urns": ["tel:********", "twitterid:********"]

With param in anon org...

"urns": [
    {
        "channel": {
            "uuid": "c9a5d98a-4c89-4f25-af96-81f06b67e019",
            "name": "Vonage"
        },
        "scheme": "tel",
        "path": "********",
        "display": null
    },
    {
        "channel": null,
        "scheme": "twitterid",
        "path": "********",
        "display": "cathy"
    }
]

No channel indicates a URN which is not sendable.

[codecov]

Codecov Report

Merging #4511 (32491d7) into main (229cbf0) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #4511   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          495       495           
  Lines        26583     26598   +15     
=========================================
+ Hits         26583     26598   +15     

Impacted Files	Coverage Δ
temba/api/v2/fields.py	100.00% <100.00%> (ø)
temba/api/v2/serializers.py	100.00% <100.00%> (ø)
temba/api/v2/views.py	100.00% <100.00%> (ø)
temba/contacts/models.py	100.00% <100.00%> (ø)
temba/mailroom/client.py	100.00% <100.00%> (ø)

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[norkans7]

should return an empty dict above?

[norkans7]

and that line is not covered so the type should be dict as the function shows I think

[rowanseymour]

good spot - just fixed that after adding more tests