Add support for SSL in Kafka to BigQuery template.

[pranavbhandari24]

After this PR is merged, customers should be able to pass in the SSL configs for the kafka consumer by following the below steps,

1. Save the truststore.jks and keystore.jks files in a GCS bucket (e.g, test-bucket)
2. Create a file and paste the following,

{
   "bucket":"test-bucket",
   "ssl.truststore.location":"truststore.jks",
   "ssl.keystore.location":"keystore.jks",
   "ssl.truststore.password":"truststore-password",
   "ssl.keystore.password":"keystore-password",
   "ssl.key.password":"admin-secret"
}

3. Replace the values in the JSON. Note, ssl.truststore.location and ssl.keystore.location should be the path of the truststore and keystore respectively under the bucket (In this example, the truststore is stored in gs://test-bucket/truststore.jks)
4. Omit any key-value pairs that are not applicable.
5. Create a Secret manager secret using that file. (https://cloud.google.com/secret-manager)
6. Pass the Secret Manager secret ID using the parameter kafkaConfigSecretId

[nishkarshv]

How do you pass "security.protocol=SASL_SSL" and SCRAM configs for Kafka here?

[mathnut02]

Any update on this PR? I have a project where I need to import data from an SSL secured kafka server and was hoping to use the dataflow template.

[github-actions[bot]]

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