Add play_media channel support to roku

[quinnhosler]

Proposed change

Support for media_player.play_media service for Roku! Currently only supports channels. Allows users to specify specific digital tuner channel for their tv to display. Modeled after DirecTV integration.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes
• This PR is related to issue:
• Link to documentation pull request: #12902

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

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[probot-home-assistant]

Hey there @ctalkington, mind taking a look at this pull request as its been labeled with a integration (roku) you are listed as a codeowner for? Thanks!

[ctalkington]

this code looks ok to me, not sstup for local testing. I still need to add some initial code tests for the media player main services so ill do that during 109 beta shouldnt hold this up.

[springstan]

Please update the documentation for roku to include this change, thanks :)

[quinnhosler]

It's done, maybe I didn't tag it correctly. #12902