Support bearer tokens for talking to GCP projects

[mhutchinson]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 28.32%. Comparing base (07aa77d) to head (cde6b6e).
Report is 58 commits behind head on main.

Files	Patch %	Lines
hammer/clients.go	0.00%	7 Missing ⚠️
hammer/hammer.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #139       +/-   ##
===========================================
- Coverage   55.99%   28.32%   -27.67%     
===========================================
  Files           8       15        +7     
  Lines         759     1451      +692     
===========================================
- Hits          425      411       -14     
- Misses        265      961      +696     
- Partials       69       79       +10     

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