Health check API

[mocsharp]

Description

New Restful APIs:

• /health/status: includes number of active DIMSE assoiations and statuses of all services.
• /health/ready & /health/live

Status

In Progress

Types of changes

• [x] Non-breaking change (fix or new feature that would not break existing functionality).
• [ ] Breaking change (fix or new feature that would cause existing functionality to change).
• [x] New tests added to cover the changes.
• [x] All tests passed locally by running ./src/run-tests-in-docker.sh.
• [x] Documentation comments included/updated.
• [x] User guide updated.
• [ ] NGC publishing metadata updated.
• [x] I have updated the changelog

[codecov-io]

Codecov Report

Merging #52 (de1487f) into release/0.8.1 (3f013e3) will increase coverage by 33.11986%. The diff coverage is 90.81003%.

@@                   Coverage Diff                    @@
##           release/0.8.1         #52          +/-   ##
========================================================
+ Coverage       52.01285%   85.13271%   +33.11986%     
========================================================
  Files                 83         132          +49     
  Lines               4670       12282        +7612     
  Branches             509         722         +213     
========================================================
+ Hits                2429       10456        +8027     
+ Misses              2073        1542         -531     
- Partials             168         284         +116     

Impacted Files	Coverage Δ
src/API/IJobStore.cs	0.00000% <ø> (ø)
src/API/Rest/HealthStatusResponse.cs	0.00000% <0.00000%> (ø)
src/Common/Test/RequiredIfAttributeTest.cs	100.00000% <ø> (ø)
src/DicomWebClient/API/ResponseDecodeException.cs	33.33333% <ø> (ø)
...comWebClient/API/UnsupportedReturnTypeException.cs	25.00000% <ø> (ø)
...rc/DicomWebClient/Test/HttpMessageExtensionTest.cs	93.68421% <ø> (ø)
src/Server/Program.cs	0.00000% <0.00000%> (ø)
src/Server/Repositories/KubernetesWrapper.cs	0.00000% <0.00000%> (ø)
src/Server/Services/Http/HealthController.cs	0.00000% <0.00000%> (ø)
.../Services/Scp/InstanceStoredNotificationService.cs	83.67347% <ø> (ø)
... and 174 more

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