feat(secrets): begin migration to secret manager from keystore

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Source-Link: https://github.com/googleapis/synthtool/commit/1c92077459db3dc50741e878f98b08c6261181e0

[codecov[bot]]

Codecov Report

Merging #194 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #194   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           67        67           
  Branches        15        15           
=========================================
  Hits            67        67           

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