test: Initial k6 smoke test coverage

[Nana-EC]

Reviewer Notes

k6 is a useful for load testing that can be easily leveraged by engineers and operators

• Add a k6 smote test dir under tooling
• Add a test files to cover BN API smote tests to confirm serverStatus, getBlock and subscribeBlockItems work
• Add a data.json file to allow for customization
• Add a README to explain the logic and how it's intended to be used

Related Issue(s)

Fixes #1875
Fixed #1669
Partial setups #1878

[mustafauzunn]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@             Coverage Diff              @@
##               main    #1876      +/-   ##
============================================
- Coverage     80.77%   80.64%   -0.14%     
+ Complexity     1178     1176       -2     
============================================
  Files           127      127              
  Lines          5550     5553       +3     
  Branches        591      591              
============================================
- Hits           4483     4478       -5     
- Misses          794      802       +8     
  Partials        273      273              

see 5 files with indirect coverage changes

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