Update service domain for epson from 'media_player' to 'epson'

[raman325]

Breaking Change:

This change breaks existing service call references to the media_player.epson_select_cmode services by changing the service calls to be epson.select_cmode. My understanding is that because this is not a service provided by the base media_player component, it should live in the domain of the epson component instead. If that's the case, then it also makes sense to update the service name.

Description:

Update the domain and service name for epson.select_cmode. See this comment for context: #28890 (comment)

Related issue (if applicable): Related to #27289

Pull request with documentation for home-assistant.io (if applicable): N/A

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist

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• Documentation added/updated in home-assistant.io

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