QRadarEpochToTimestamp for exponential notation

[KaneBrennan132]

When using "group by" during an AQL passthrough, it was found that Qradar can return epoch values using exponential notation (e.g 1.674125456158E12) and this would fail being transformed into a timestamp, causing the DE search to fail.

Added a custom epoch to timestamp transformer that handles epoch values using exponential notation.

[delliott90]

Can we get a unit test around this?

[codecov]

Codecov Report

Patch coverage: 95.55% and project coverage change: +0.01 🎉

Comparison is base (8a82d3f) 85.42% compared to head (9a5d33a) 85.43%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1352      +/-   ##
===========================================
+ Coverage    85.42%   85.43%   +0.01%     
===========================================
  Files          569      569              
  Lines        42693    42734      +41     
===========================================
+ Hits         36471    36511      +40     
- Misses        6222     6223       +1     

Impacted Files	Coverage Δ
...er_modules/qradar/stix_translation/transformers.py	81.25% <75.00%> (-2.09%)	⬇️
.../stix_translation/test_elastic_ecs_json_to_stix.py	100.00% <100.00%> (ø)
...tests/stix_translation/test_qradar_json_to_stix.py	100.00% <100.00%> (ø)
...r_utils/stix_translation/src/utils/transformers.py	83.25% <0.00%> (+0.47%)	⬆️

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[KaneBrennan132]

Added test for start and end time epoch values using exponential notation.