Add OSSF scorecard badge

[trask]

We get a couple of CLOMonitor points for this 😄

I filled out https://www.bestpractices.dev/en/projects/9991 on behalf of this repo. @jack-berg @jkwatson I think you should have access to edit it as maintainers of this repo, let me know if not, there was a place I could add github aliases to grant edit permissions.

Opening as draft now until we get the score up a bit.

Related to #7068

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.84%. Comparing base (9f0a291) to head (811d0e2).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7073   +/-   ##
=========================================
  Coverage     89.84%   89.84%           
  Complexity     6610     6610           
=========================================
  Files           740      740           
  Lines         19981    19981           
  Branches       1966     1966           
=========================================
  Hits          17951    17951           
  Misses         1440     1440           
  Partials        590      590           

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[jack-berg]

I think you should have access to edit it as maintainers of this repo

Confirmed!