Add contacts sources filter

[seniordevel]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.
• I optionally donated to support the Fossify mission.

Feature description

Please add a persistent contacts sources filter as available in 'Fossify Contacts', e.g. to disable certain contact sources as coming from 'USIM' card.

When pressing + to create a new message, the contacts are shown from all sources. Unfortunately no source filter available.

Why do you want this feature?

My prepaid SIM card automatically adds lots of new contacts (expensive services) to my personal contact list.
I do not want to see those services between my own contacts.

I can can delete those SIM services, but they will come back almost immediately.
The only solution for me was:

1. move all my personal contacts to Phone or 'phone storage'
2. uncheck 'USIM' as source

I would like to be able to the same in 'Fossify Messages'

Additional information

note: This might be related to (or solution for) unsolved issue #183