Makes health configuration optional

[codefromthecrypt]

A previous change fixed health status mapping, but in the process made
it required to have health autoconfiguration. This fixes the below
error:

Parameter 3 of method actuatorServerConfigurator in com.linecorp.armeria.spring.actuate.ArmeriaSpringActuatorAutoConfiguration required a bean of type 'org.springframework.boot.actuate.health.HealthStatusHttpMapper' that could not be found.

[trustin]

Thanks @adriancole !

[minwoox]

Thanks! 👍

[codecov]

Codecov Report

Merging #2104 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master   #2104      +/-   ##
===========================================
- Coverage     73.71%   73.7%   -0.02%     
  Complexity     9466    9466              
===========================================
  Files           831     831              
  Lines         36495   36496       +1     
  Branches       4516    4516              
===========================================
- Hits          26903   26899       -4     
- Misses         7273    7279       +6     
+ Partials       2319    2318       -1

Impacted Files	Coverage Δ	Complexity Δ
...ctuate/ArmeriaSpringActuatorAutoConfiguration.java	97.61% <100%> (+0.05%)	12 <1> (+1)	⬆️
...om/linecorp/armeria/client/HttpSessionHandler.java	61.01% <0%> (-11.02%)	29% <0%> (-4%)
...necorp/armeria/server/GracefulShutdownSupport.java	97.43% <0%> (-2.57%)	4% <0%> (ø)
...a/common/grpc/protocol/ArmeriaMessageDeframer.java	69.9% <0%> (-1.46%)	45% <0%> (-2%)
.../linecorp/armeria/client/Http2ResponseDecoder.java	61.66% <0%> (+0.83%)	33% <0%> (+1%)	⬆️
...rp/armeria/common/stream/DefaultStreamMessage.java	90.71% <0%> (+1.42%)	54% <0%> (+1%)	⬆️
...om/linecorp/armeria/server/jetty/JettyService.java	66% <0%> (+2.95%)	24% <0%> (+1%)	⬆️
.../armeria/client/endpoint/dns/DnsEndpointGroup.java	86.31% <0%> (+3.15%)	15% <0%> (+2%)	⬆️

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[ikhoon]

Thanks!