Add msg_processing_type field to message action

[d-gubert]

Adds the field introduced in this PR to the engine.

No further changes are needed on Rocket.Chat for it to work.

[codecov]

Codecov Report

Merging #117 into master will increase coverage by 1.77%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
+ Coverage   60.84%   62.62%   +1.77%     
==========================================
  Files          58       65       +7     
  Lines        2084     2183      +99     
  Branches      322      322              
==========================================
+ Hits         1268     1367      +99     
  Misses        816      816

Impacted Files	Coverage Δ
src/server/errors/index.ts	100% <0%> (ø)
src/server/managers/index.ts	100% <0%> (ø)
src/server/accessors/index.ts	100% <0%> (ø)
src/server/compiler/index.ts	100% <0%> (ø)
src/server/storage/index.ts	100% <0%> (ø)
src/server/logging/index.ts	100% <0%> (ø)
src/server/bridges/index.ts	100% <0%> (ø)

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[graywolf336]

Wish there was documentation added that said what each of these do. They both seem the same to me :(

Does sendMessage actually send a message without populating the text area for the user to edit beforehand? Or is that respondWithMessage or what?