Add more crypto logs

[Anderas]

Relates to https://github.com/vector-im/crypto-internal/issues/21

Based on rageshake investigations, curb existing logs, but adding more detail to some, and removing other

[pixlwave]

LGTM

[codecov]

Codecov Report

Base: 37.40% // Head: 37.40% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (a328347) compared to base (395bb44).
Patch coverage: 23.52% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1724   +/-   ##
========================================
  Coverage    37.40%   37.40%           
========================================
  Files          612      612           
  Lines        96165    96171    +6     
  Branches     41587    41588    +1     
========================================
+ Hits         35967    35973    +6     
+ Misses       59143    59142    -1     
- Partials      1055     1056    +1     

Impacted Files	Coverage Δ
MatrixSDK/Crypto/MXCryptoV2.swift	14.04% <ø> (+0.07%)	⬆️
...trixSDK/Crypto/CryptoMachine/MXCryptoMachine.swift	22.42% <10.00%> (-0.18%)	⬇️
...o/Algorithms/RoomEvent/MXRoomEventEncryption.swift	80.71% <42.85%> (-2.38%)	⬇️
MatrixSDK/Crypto/Algorithms/Olm/MXOlmDecryption.m	43.06% <0.00%> (-3.83%)	⬇️
...yncResponseFileStore/MXSyncResponseFileStore.swift	72.95% <0.00%> (-1.54%)	⬇️
MatrixSDK/Crypto/MXOlmDevice.m	80.95% <0.00%> (-0.65%)	⬇️
...Data/Store/MXRealmCryptoStore/MXRealmCryptoStore.m	68.79% <0.00%> (-0.22%)	⬇️
MatrixSDK/MXSession.m	39.97% <0.00%> (+0.08%)	⬆️
...SDK/Crypto/Verification/MXKeyVerificationManager.m	53.98% <0.00%> (+0.35%)	⬆️
MatrixSDK/Space/MXSpaceNotificationCounter.swift	71.42% <0.00%> (+1.86%)	⬆️
... and 2 more

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