reduce direct imports of logrus

[thaJeztah]

log: define Fields type as alternative for logrus.Fields

reduce direct imports of logrus

swap logrus types for their swarmkit/v2/logs alternatives

- What I did

- How I did it

- How to test it

- Description for the changelog

[codecov-commenter]

Codecov Report

Merging #3148 (cd9912a) into master (88a8e0a) will decrease coverage by 0.01%.
Report is 3 commits behind head on master.
The diff coverage is 66.15%.

@@            Coverage Diff             @@
##           master    #3148      +/-   ##
==========================================
- Coverage   61.71%   61.70%   -0.01%     
==========================================
  Files         155      155              
  Lines       31145    31143       -2     
==========================================
- Hits        19221    19217       -4     
- Misses      10381    10382       +1     
- Partials     1543     1544       +1     

[thaJeztah]

• similar to swap logrus types for their containerd/logs aliases moby#46123

[thaJeztah]

@dperny @AkihiroSuda @corhere PTAL

[dperny]

We should have done this a long time ago. Good idea.

[thaJeztah]

I think there's still some spots where it's used, but at least this brings us "somewhat" there. Further discussion also happening in containerd on this PR;

• log: cleanups and improvements to decouple more from logrus containerd/containerd#8894