feat: Add support for avro

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/Dlp/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:b036a7f4278d9deb5796f065e5c7f608d47d75369985ca7ab5039998120e972d
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/privacy/dlp/artman_dlp_v2.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/php/google-cloud-dlp-v2.
synthtool > Replaced 'Copyright \\d{4}' in src/V2/Gapic/DlpServiceGapicClient.php.
synthtool > Replaced 'Copyright \\d{4}' in src/V2/DlpServiceClient.php.
synthtool > Replaced 'Copyright \\d{4}' in tests/Unit/V2/DlpServiceClientTest.php.
synthtool > Replaced '@type InspectJobConfig \\$inspectJob\\n' in src/V2/Gapic/DlpServiceGapicClient.php.
synthtool > Replaced '@type RiskAnalysisJobConfig \\$riskJob\\n' in src/V2/Gapic/DlpServiceGapicClient.php.
synthtool > No replacements made in src/V2/Gapic/DlpServiceGapicClient.php for pattern RedactImageRequest_ImageRedactionConfig, maybe replacement is not longer needed?
synthtool > Cleaned up 1 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #2050 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2050   +/-   ##
=========================================
  Coverage     92.57%   92.57%           
  Complexity     4378     4378           
=========================================
  Files           304      304           
  Lines         13012    13012           
=========================================
  Hits          12046    12046           
  Misses          966      966

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