Use ts strict checking for binding mqtt

[egekorkan]

I had started on this but did not manage to move forward due to time constraints. I still wanted to make it public so that others can take the work.

@hasanheroglu maybe you can have a quick look? Otherwise, I will try to get back to it in two weeks :)

[codecov]

Codecov Report

Merging #1053 (28c0815) into master (597f34d) will decrease coverage by 0.17%.
Report is 15 commits behind head on master.
The diff coverage is 52.32%.

@@            Coverage Diff             @@
##           master    #1053      +/-   ##
==========================================
- Coverage   75.54%   75.38%   -0.17%     
==========================================
  Files          80       80              
  Lines       15341    15443     +102     
  Branches     1460     1477      +17     
==========================================
+ Hits        11590    11641      +51     
- Misses       3717     3766      +49     
- Partials       34       36       +2     

Files Changed	Coverage Δ
packages/binding-mqtt/src/mqtt-client.ts	74.14% <40.00%> (-5.43%)	⬇️
packages/binding-mqtt/src/mqtt-broker-server.ts	74.78% <56.66%> (-2.24%)	⬇️
packages/binding-mqtt/src/mqtt.ts	94.20% <100.00%> (ø)

... and 5 files with indirect coverage changes

[relu91]

@danielpeintner should be ready to go. I think in this case we can squash and merge.

[relu91]

argh I forgot to squash :/

[egekorkan]

Thanks for doing it! :)