Support Retrieving Conversation by Name

[itsmechlark]

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[pablovarela]

I am merging this. I had to do a couple of changes:

1. Updated documentation as is_private is only uses when name attribute is set.
2. updated new test to use name in the data source. The provided test was searching by ID.
3. The test show a bug that didn't set channel_id when name is used

The tests could do with some refactoring but I don't have time now to do it.

Thanks a lot for your contribution!

Note: tests are not passing in this PR due to authentication issues but they pass just fine locally. They will work once merged.

[pablovarela]

This is now part of v1.2.0 release