Allow disabling all messaging functionality.

[RokeJulianLockhart]

Describe your suggested feature

The feature would disable:

1. The relevant navigation bar entry (and probably hide the navigation bar, consequently).
2. All relevant configuration entries.

Additionally, it would revoke all relevant permissions.

Other details

I only want Connect You to function solely as a contact management application, like its competitors do.

It seems very strange to me to combine VCF modification and synchronisation with SMS, MMS, and RCS communication, because:

1. There is little commonality amongst them
2. Brilliant solutions already exist, meaning that most people with this application installed already have a messenger installed.
3. The permissions necessary for a messenger to function are significantly more broad than those of a contact management application.

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.
• I have written a short but informative title.
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