[load] Adding CLI support for engine reference identity feature

[Himanshu49]

Added two new parameter --engine-ref-ids and --engine-ref-id-type to 'az load test create' and 'az load test update' commands.
Added their corresponding validators, logic and tests.

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• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally? (pip install wheel==0.30.0 required)
• My extension version conforms to the Extension version schema

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[azure-client-tools-bot-prd]

⚠️Azure CLI Extensions Breaking Change Test

⚠️load

rule	cmd_name	rule_message	suggest_message
⚠️ 1006 - ParaAdd	load test create	cmd load test create added parameter engine_ref_id_type
⚠️ 1006 - ParaAdd	load test create	cmd load test create added parameter engine_ref_ids
⚠️ 1006 - ParaAdd	load test update	cmd load test update added parameter engine_ref_id_type
⚠️ 1006 - ParaAdd	load test update	cmd load test update added parameter engine_ref_ids

[azure-client-tools-bot-prd]

Hi @Himanshu49,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[github-actions]

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Please sync the latest code with latest dev branch (for azure-cli) or main branch (for azure-cli-extensions).
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[github-actions]

• For more info about extension versioning, please refer to Extension version schema

[kairu-ms]

/azp run

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Azure Pipelines successfully started running 2 pipeline(s).

[kairu-ms]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[azclibot]

[Release] Update index.json for extension [ load-1.6.0 ] : https://dev.azure.com/msazure/One/_build/results?buildId=116543830&view=results