Use gzip compression for data sent from agent

[petertrr]

What's done:

• Support in agent

POST /heartbeat HTTP/1.1
Host: host.docker.internal:5100
Accept: application/json,application/json
Accept-Encoding: gzip
Accept-Charset: UTF-8
User-Agent: Ktor client
Content-Type: application/json
Content-Length: 103

Related to #298

[codecov]

Codecov Report

Merging #329 (c50a3bc) into master (b189f49) will decrease coverage by 0.31%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #329      +/-   ##
============================================
- Coverage     75.78%   75.46%   -0.32%     
- Complexity      279      280       +1     
============================================
  Files            36       36              
  Lines          1276     1280       +4     
  Branches         96       98       +2     
============================================
- Hits            967      966       -1     
- Misses          208      211       +3     
- Partials        101      103       +2     

Impacted Files	Coverage Δ
...ave/backend/controllers/TestExecutionController.kt	75.00% <100.00%> (+1.66%)	⬆️
.../cqfn/save/orchestrator/docker/ContainerManager.kt	87.32% <100.00%> (+0.18%)	⬆️
...n/save/orchestrator/controller/AgentsController.kt	71.11% <0.00%> (-8.38%)	⬇️
...rg/cqfn/save/orchestrator/service/DockerService.kt	69.56% <0.00%> (-0.86%)	⬇️

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[orchestr7]

Looks like it is done, haha :)

[petertrr]

Looks like it is done, haha :)

Not quite, it looks like it only adds support for decoding gzipped responses from the server. I was inspecting traffic with tcpdump, and request body still is displayed in plain text.