Feature/5 ebs findings prop

[Aboisier]

This PR implements findings for EBS snapshots from #5.

• Added method which calculates the most recent snapshot for each volume
• Added attributes in the EBS snapshots dashboard

Please review the proprietary PR as well.

[codecov-io]

Codecov Report

Merging #160 into develop will decrease coverage by 0.02%.
The diff coverage is 14.28%.

@@             Coverage Diff             @@
##           develop     #160      +/-   ##
===========================================
- Coverage    30.28%   30.25%   -0.03%     
===========================================
  Files           66       66              
  Lines         4316     4323       +7     
===========================================
+ Hits          1307     1308       +1     
- Misses        3009     3015       +6

Impacted Files	Coverage Δ
ScoutSuite/providers/aws/provider.py	10.95% <14.28%> (+0.04%)	⬆️

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