Rewrite with spring webflux

[codecov[bot]]

Codecov Report

Merging #448 (0833be2) into develop (1de891e) will decrease coverage by 1.02%. Report is 12 commits behind head on develop. The diff coverage is 87.62%.

@@              Coverage Diff              @@
##             develop     #448      +/-   ##
=============================================
- Coverage      85.32%   84.30%   -1.02%     
+ Complexity       113       78      -35     
=============================================
  Files             10       10              
  Lines            552      427     -125     
  Branches          53       52       -1     
=============================================
- Hits             471      360     -111     
+ Misses            49       44       -5     
+ Partials          32       23       -9     

Files Changed	Coverage Δ
...a/com/jyuzawa/googolplex_theater/DeviceConfig.java	90.47% <ø> (ø)
...ava/com/jyuzawa/googolplex_theater/MapperUtil.java	88.88% <ø> (ø)
...m/jyuzawa/googolplex_theater/ReceiverResponse.java	74.07% <ø> (ø)
.../jyuzawa/googolplex_theater/GoogolplexTheater.java	5.88% <7.14%> (-54.12%)	:arrow_down:
.../googolplex_theater/GoogolplexClientException.java	50.00% <50.00%> (ø)
...jyuzawa/googolplex_theater/DeviceConfigLoader.java	73.33% <77.77%> (ø)
...m/jyuzawa/googolplex_theater/GoogolplexClient.java	89.55% <89.55%> (ø)
.../jyuzawa/googolplex_theater/GoogolplexService.java	96.61% <96.61%> (ø)
...uzawa/googolplex_theater/GoogolplexController.java	100.00% <100.00%> (ø)
...m/jyuzawa/googolplex_theater/ServiceDiscovery.java	80.00% <100.00%> (ø)