Added support for providing Log Analytics Id and Key, and Custom columns in the pod spec

[pvashisht888]

1. Added a CA cert env var so that we can see logs through kubectl for a pod running in ACI.
2. Added a new extension for CustomLogger so that logs can be seen in a Log Analytics workspace for a CG running in ACI through the virtual kubelet. The LA Id and Key is provided through the annotations in the pod spec.
3. Added support for showing custom columns in Log Analytics workspace for a CG running in ACI through the virtual kubelet. These custom columns (and their values) are also provided in the pod spec as an annotation which are then parsed and supplied to the custom logger extension. These columns (and their values) are visible in ContainerAppConsoleLogs_CL table in the Log Analytics workspace.

[codecov-commenter]

Codecov Report

Merging #352 (f79b88c) into master (55027d0) will increase coverage by 0.75%.
The diff coverage is 85.00%.

@@            Coverage Diff             @@
##           master     #352      +/-   ##
==========================================
+ Coverage   44.65%   45.41%   +0.75%     
==========================================
  Files          46       46              
  Lines        5860     5919      +59     
==========================================
+ Hits         2617     2688      +71     
+ Misses       2992     2979      -13     
- Partials      251      252       +1     

Impacted Files	Coverage Δ
provider/aci.go	40.63% <85.00%> (+2.85%)	⬆️
provider/aciMock.go	65.51% <0.00%> (+1.14%)	⬆️

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