Sync polls rules (PSG-77, PSG-1097)

[alfogrillo]

Description

This PR add completion blocks for updating push rules.
Completion blocks have been added for:

• Enabling/disabling a push rule
• Updated actions of a push rule

[codecov]

Codecov Report

Base: 17.43% // Head: 37.53% // Increases project coverage by +20.09% 🎉

Coverage data is based on head (1f5997c) compared to base (46a6764).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head 1f5997c differs from pull request most recent head 0fe0d74. Consider uploading reports for the commit 0fe0d74 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1702       +/-   ##
============================================
+ Coverage    17.43%   37.53%   +20.09%     
============================================
  Files          610      610               
  Lines        95234    95252       +18     
  Branches     40122    41333     +1211     
============================================
+ Hits         16607    35755    +19148     
+ Misses       78122    58456    -19666     
- Partials       505     1041      +536     

Impacted Files	Coverage Δ
...atrixSDK/NotificationCenter/MXNotificationCenter.m	21.93% <0.00%> (+4.96%)	⬆️
...o/Algorithms/RoomEvent/MXRoomEventDecryption.swift	54.80% <0.00%> (-0.54%)	⬇️
MatrixSDK/Utils/Media/MXMediaManager.m	1.88% <0.00%> (+0.47%)	⬆️
MatrixSDK/Contrib/Swift/MXRestClient.swift	2.22% <0.00%> (+0.74%)	⬆️
...gations/LocationSharing/MXBeaconAggregations.swift	4.44% <0.00%> (+1.26%)	⬆️
MatrixSDKTests/MXBackgroundSyncServiceTests.swift	1.84% <0.00%> (+1.84%)	⬆️
...trixSDK/Crypto/CrossSigning/MXCrossSigningV2.swift	23.12% <0.00%> (+1.87%)	⬆️
MatrixSDK/Contrib/Swift/MXSession.swift	14.38% <0.00%> (+2.05%)	⬆️
MatrixSDK/Crypto/Recovery/MXRecoveryService.m	2.33% <0.00%> (+2.33%)	⬆️
...ventsEnumerator/MXEventsByTypesEnumeratorOnArray.m	91.89% <0.00%> (+2.70%)	⬆️
... and 192 more

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[stefanceriu]

Some comments inline, looks good otherwise 👍