refactor: move otkafka/processor out of core (close #155)

[GGXXLL]

move to core-processor

[codecov]

Codecov Report

Merging #156 (b41b05c) into master (affda16) will decrease coverage by 0.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #156      +/-   ##
==========================================
- Coverage   79.98%   79.75%   -0.23%     
==========================================
  Files          94       92       -2     
  Lines        3872     3730     -142     
==========================================
- Hits         3097     2975     -122     
+ Misses        554      544      -10     
+ Partials      221      211      -10     

Impacted Files	Coverage Δ
config/watcher/file.go	58.13% <0.00%> (-4.66%)	⬇️
dtx/sagas/mysqlstore/mysql_store.go	84.14% <0.00%> (-3.66%)	⬇️

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[Reasno]

why move?

[GGXXLL]

why move?

Processor is a small module.
If the processor is modified, the whole package of core is not required to follow the release.

[Reasno]

Seeing this is a huge breaking change, I am gonna hold on this removal until a major
release.