Actuator: Add Actuator

[swarajsaaj]

Add actuator and relevant properties

Did not add metrics/Prometheus (I think it should be part of dedicated PR), maybe allow multiple exports (datadog, Prometheus etc.) .

Fix #198

[codecov]

Codecov Report

Merging #345 (7575136) into main (e15ffc5) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main      #345   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       522       538   +16     
===========================================
  Files             93        93           
  Lines           1690      1724   +34     
  Branches          32        36    +4     
===========================================
+ Hits            1690      1724   +34     

Impacted Files	Coverage Δ
...b/application/SpringBootMvcApplicationService.java	100.00% <100.00%> (ø)
...erver/springboot/mvc/web/domain/SpringBootMvc.java	100.00% <100.00%> (ø)
...oot/mvc/web/domain/SpringBootMvcDomainService.java	100.00% <100.00%> (ø)
...astructure/primary/rest/SpringBootMvcResource.java	100.00% <100.00%> (ø)
src/main/java/tech/jhipster/lite/JHLiteApp.java	100.00% <0.00%> (ø)
...va/tech/jhipster/lite/common/domain/FileUtils.java	100.00% <0.00%> (ø)
...r/lite/generator/buildtool/maven/domain/Maven.java	100.00% <0.00%> (ø)
...r/lite/generator/project/domain/DefaultConfig.java	100.00% <0.00%> (ø)
...tor/buildtool/maven/domain/MavenDomainService.java	100.00% <0.00%> (ø)
...init/infrastructure/primary/rest/InitResource.java	100.00% <0.00%> (ø)
... and 12 more

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[pascalgrimaud]

Thanks! I'll review it tomorrow