Add event logger type and function to set event context for writer

[MarlonGamez]

Related: #5368

Description
Adds event logger type which will turn things passed to it's write function into SkaffoldLogEvents to be sent through the event API v2.

No functional changes here, just adding the functions that will be tied to execution later. Also removes pkg/skaffold/event/v2's reliance on pkg/skaffold/event's Config interface, instead having it's own. This removes an import cycle that was occuring

Follow-up Work (remove if N/A)
Hook these up to an endpoint and set proper event contexts throughout skaffold execution

[codecov]

Codecov Report

Merging #5937 (203acac) into master (aa9b115) will decrease coverage by 0.02%.
The diff coverage is 60.86%.

@@            Coverage Diff             @@
##           master    #5937      +/-   ##
==========================================
- Coverage   70.66%   70.63%   -0.03%     
==========================================
  Files         454      455       +1     
  Lines       17399    17425      +26     
==========================================
+ Hits        12295    12309      +14     
- Misses       4196     4206      +10     
- Partials      908      910       +2     

Impacted Files	Coverage Δ
pkg/skaffold/event/v2/event.go	74.03% <0.00%> (ø)
pkg/skaffold/event/v2/logger.go	52.94% <52.94%> (ø)
pkg/skaffold/output/output.go	80.64% <100.00%> (+3.72%)	⬆️
pkg/skaffold/util/tar.go	50.66% <0.00%> (-5.34%)	⬇️
...ffold/kubernetes/portforward/resource_forwarder.go	78.87% <0.00%> (-1.73%)	⬇️
pkg/skaffold/docker/parse.go	87.14% <0.00%> (+0.95%)	⬆️

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[tejal29]

Can you add some notes on how to test this out? Shd we see the log message on skaffoldLog endpoint?

[MarlonGamez]

@tejal29 this currently isn't hooked up to anything yet, I just wanted to add the functions and types for review to split things up a bit. A follow up to this will actually hook things up and setup certain things like the skaffoldLogs endpoint