NOISSUE - Trace MQTT forward operations

[SammyOina]

Pull request title should be MF-XXX - description or NOISSUE - description where XXX is ID of issue that this PR relate to.
Please review the CONTRIBUTING.md file for detailed contributing guidelines.

What does this do?

Trace MQTT forward operations

Which issue(s) does this PR fix/relate to?

There is no such issue.

List any changes that modify/break current functionality

None

Have you included tests for your changes?

Ni

Did you document any new/modified functionality?

No

Notes

[codecov-commenter]

Codecov Report

Merging #1775 (a56e729) into master (029140a) will decrease coverage by 0.01%.
The diff coverage is 78.94%.

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@@            Coverage Diff             @@
##           master    #1775      +/-   ##
==========================================
- Coverage   70.00%   69.99%   -0.01%     
==========================================
  Files         149      149              
  Lines       11803    11816      +13     
==========================================
+ Hits         8263     8271       +8     
- Misses       2870     2875       +5     
  Partials      670      670              

Impacted Files	Coverage Δ
http/api/transport.go	69.30% <0.00%> (-2.13%)	⬇️
things/api/auth/grpc/server.go	79.48% <0.00%> (-2.10%)	⬇️
mqtt/handler.go	92.98% <88.00%> (+0.52%)	⬆️
bootstrap/service.go	83.10% <100.00%> (ø)

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[dborovcanin]

@SammyOina The goal of this initiative is not to add a tracer to the Forward method but to improve tracing on the MQTT Proxy side. This implies some changes in the Handler interface in mProxy. We need context there anyways, so it's an excellent opportunity to add it now.

[SammyOina]

[drasko]

LGTM