Add served-model support to serving endpoint query

[aidint]

What changes are proposed in this pull request?

This PR adds support for querying an individual model in the serving endpoints as documented here.

• WHAT changes are being made in the PR?
  It adds served-models to the url used for the query requests if served_model_name is provided.
• WHY are these changes needed?
  While querying an individual model behind a serving endpoint is supported by rest api, it is not supported by the sdk. This limits users flexibility in serving multiple models in one endpoint. I raised this problem in this issue.

How is this tested?

I tested this with an endpoint in a private databricks workspace.

Describe any tests you have done; especially if test tests are not part of
the unit tests (e.g. local tests).

I couldn't find any test case for the query methods, therefore the answer is N/A.

[github-actions]

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[github-actions]

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Inputs:

• PR number: 1044
• Commit SHA: 0fba34c9ff53b99cbfd78a3fef98c43b5fd0ef94

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[aidint]

@hectorcast-db can you please help me with this PR?

[aidint]

@rauchy can you please review this pull request?

[hectorcast-db]

Hi @aidint
Thanks for reaching out and the PR.
Unfortunately, we cannot merge this PR. The code for services is auto generated, so any manual change will be automatically reverted.
I will forward this to the team so they can update their configuration upstream.