feat(persistence): save channel.ownCapabilities in db

[xsahil03x]

Fixes: #1102

[codecov]

Codecov Report

Merging #1198 (621daba) into develop (c40580c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1198   +/-   ##
========================================
  Coverage    68.04%   68.05%           
========================================
  Files          228      228           
  Lines        23488    23490    +2     
========================================
+ Hits         15983    15985    +2     
  Misses        7505     7505           

Impacted Files	Coverage Δ
...at_persistence/lib/src/db/drift_chat_database.dart	70.00% <ø> (ø)
...hat_persistence/lib/src/mapper/channel_mapper.dart	100.00% <100.00%> (ø)

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