Better handling of JSON data sent via HEC

[atoulme]

Description:
Handle cases where the time field of HEC events is encoded as a String

Link to tracking Issue:
#2158

Testing:
Unit tests

[codecov]

Codecov Report

Merging #2159 (35b5979) into master (834ec70) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2159   +/-   ##
=======================================
  Coverage   90.38%   90.38%           
=======================================
  Files         397      397           
  Lines       19495    19523   +28     
=======================================
+ Hits        17620    17646   +26     
- Misses       1410     1411    +1     
- Partials      465      466    +1     

Flag	Coverage Δ
integration	69.75% <ø> (+0.06%)	⬆️
unit	89.17% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/splunk/common.go	100.00% <100.00%> (ø)
receiver/k8sclusterreceiver/watcher.go	95.29% <0.00%> (-2.36%)	⬇️

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