feat: Publish Binary Authorization ContinuousValidationEvent proto.

[gcf-owl-bot]

This is used in the new Continuous Validation feature:
https://cloud.google.com/binary-authorization/docs/overview-cv

Committer: @rbutoi
PiperOrigin-RevId: 373173593

Source-Link: googleapis/googleapis@bceaea9

Source-Link: https://github.com/googleapis/googleapis-gen/commit/39d9de2c002fc493a3169300a79dec7201803538

[codecov]

Codecov Report

Merging #50 (e25d06e) into master (0f5237b) will decrease coverage by 0.06%.
The diff coverage is 89.79%.

❗ Current head e25d06e differs from pull request most recent head 47c106a. Consider uploading reports for the commit 47c106a to get more accurate results

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
- Coverage   95.95%   95.89%   -0.07%     
==========================================
  Files           5        5              
  Lines        1385     1363      -22     
  Branches       53       52       -1     
==========================================
- Hits         1329     1307      -22     
  Misses         55       55              
  Partials        1        1              

Impacted Files	Coverage Δ
...ta1/binauthz_management_service_v1_beta1_client.ts	97.39% <89.36%> (-0.05%)	⬇️
src/index.ts	100.00% <100.00%> (ø)

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