add EVM event manager to context

[codchen]

Describe your changes and provide context

Add a new event manager for EVM events. This for now will only be used for handling EVM events generated during interop.

Testing performed to validate your change

sei-chain integration

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 55.31%. Comparing base (69add60) to head (e7d1c75).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #516      +/-   ##
==========================================
- Coverage   55.31%   55.31%   -0.01%     
==========================================
  Files         631      631              
  Lines       54215    54226      +11     
==========================================
+ Hits        29990    29993       +3     
- Misses      22081    22089       +8     
  Partials     2144     2144              

Files	Coverage Δ
types/events.go	73.09% <40.00%> (-0.76%)	⬇️
types/context.go	58.00% <66.66%> (-1.11%)	⬇️