Feature/validator diagnostics

[Jayashsatolia403]

Changes

Fixes

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #1205 (7cfad4f) into sprint-july-4 (3a1a405) will decrease coverage by 0.17%.
The diff coverage is 4.10%.

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@@                Coverage Diff                @@
##           sprint-july-4    #1205      +/-   ##
=================================================
- Coverage          25.52%   25.35%   -0.17%     
=================================================
  Files                 81       82       +1     
  Lines               9136     9209      +73     
=================================================
+ Hits                2332     2335       +3     
- Misses              6514     6584      +70     
  Partials             290      290              

Flag	Coverage Δ
Unit-Tests	25.35% <4.10%> (-0.17%)	⬇️

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

Files Changed	Coverage Δ
...ain.net/validatorcore/storage/challenge_handler.go	24.29% <0.00%> (-0.71%)	⬇️
...o/0chain.net/validatorcore/storage/handler_main.go	0.00% <0.00%> (ø)
.../0chain.net/validatorcore/storage/stats_handler.go	4.41% <4.41%> (ø)

[dabasov]

lgtm

[dabasov]

add mutex to update stats

[dabasov]

lgtm