feat(general): Implement advanced context normalization

[jan-auer]

Ports the logic from https://github.com/getsentry/sentry/blob/f5ed88003a9fb5885b774b01ff8b69501edf0e98/src/sentry/utils/contexts_normalization.py

[codecov-io]

Codecov Report

Merging #140 into master will increase coverage by 0.6%.
The diff coverage is 86.95%.

@@            Coverage Diff            @@
##           master     #140     +/-   ##
=========================================
+ Coverage    55.6%   56.21%   +0.6%     
=========================================
  Files          81       82      +1     
  Lines        8416     8576    +160     
=========================================
+ Hits         4680     4821    +141     
- Misses       3736     3755     +19

Impacted Files	Coverage Δ
general/src/store/normalize.rs	80.3% <0%> (-0.63%)	⬇️
general/src/protocol/contexts.rs	97.12% <100%> (+0.02%)	⬆️
general/src/store/normalize/contexts.rs	88.46% <88.46%> (ø)
general/src/protocol/types.rs	70% <0%> (+0.71%)	⬆️

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