Enable name-to-id translation for private channels

[eizengan]

Ran into another hitch with name-to-id translation: the gem is only capable of translating public channels.

This first pass does the minimum amount of work to make the feature happen. It has an obvious flaw, however, in that the continued addition of new arguments feels untenable (e.g. team_id or exclude_archived). Perhaps this is the last argument we need/want, and the first-pass solution is fine - or perhaps not. It's a good starting point for conversation, regardless. We can refine once I hear your thoughts.

[coveralls]

Pull Request Test Coverage Report for Build 15853774080

Details

• 5 of 5 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.007%) to 90.385%

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Totals
Change from base Build 15252449956:	0.007%
Covered Lines:	5913
Relevant Lines:	6542

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💛 - Coveralls

[dblock]

Looks ok to me, what is the concern? Having to fetch another 2 parameters?

[eizengan]

Looks ok to me, what is the concern? Having to fetch another 2 parameters?

A twofold concern:

• we again solve the need for one specific parameter instead of providing a method of passing whatever parameters are needed
• expansion to the other parameters in the same manner (i.e. more options.fetch(:id_*, nil)s) feels ugly

If we instead plucked options[:id_options] and forwarded that in its entirety that might be better, but it's also incompatible with my prior addition of id_limit without some massaging. If you're interested I can tentatively push a commit containing that change.

[dblock]

The number of parameters passed here is limited, so I am ok with this. Want to open a PR for the rest of them?

[eizengan]

Want to open a PR for the rest of them?

Sure - might as well while I'm in here; save someone else the trouble down the line

[eizengan]

Closing the loop: the other additions are in #560