Add OSSF Scorecard

[artemgavrilov]

PMM-7

This PR adds OSSF Scorecard workflow and badge in readme
https://scorecard.dev/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.07%. Comparing base (91a1d25) to head (8c599b4).
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3300   +/-   ##
=======================================
  Coverage   42.07%   42.07%           
=======================================
  Files         399      399           
  Lines       50722    50722           
=======================================
+ Hits        21339    21341    +2     
+ Misses      27375    27371    -4     
- Partials     2008     2010    +2     

Flag	Coverage Δ
admin	11.59% <ø> (+0.04%)	⬆️
agent	51.98% <ø> (ø)
managed	42.79% <ø> (ø)
vmproxy	68.57% <ø> (ø)

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