fix(core): Return InboundMessageContext from MessageReceiver

[cvarjao]

See issue #762

[codecov-commenter]

Codecov Report

Merging #763 (c3a5399) into main (2ad600c) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #763   +/-   ##
=======================================
  Coverage   86.86%   86.86%           
=======================================
  Files         393      393           
  Lines        9226     9228    +2     
  Branches     1624     1624           
=======================================
+ Hits         8014     8016    +2     
  Misses       1153     1153           
  Partials       59       59           

Impacted Files	Coverage Δ
packages/core/src/agent/MessageReceiver.ts	78.40% <100.00%> (+0.35%)	:arrow_up:

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[TimoGlastra]

Closing, please reopen if needed