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We already have the option to use Xds credentials based on `secure_mode`
flag, this PR add the ability to create Xds server based on the same
flag.
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* Latency in 50 percentile:
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Verified that when following User Guide, we're able to collect metrics
and export to GCP.
Images are available at:
*
`us-docker.pkg.dev/grpc-testing/examples/csm-o11y-example-python-client:latest`
*
`us-docker.pkg.dev/grpc-testing/examples/csm-o11y-example-python-server:latest`
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