Azure-batch-cli-extensions

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* **Breaking** Model signatures are now using only keywords-arguments syntax. Each positional argument must be rewritten as a keyword argument.

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* Fix bug related to mis-configured endpoints for storage operations.

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* Enable using cloud shell AAD token for extension SDK
* Fix bug on using default thread count to submit tasks on the machine with odd number CPU cores

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* Align to Python SDK for shared models

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* Update add_collection function of ExtendedTaskOperations to retry failed requests due to server errors.
* Update add_collection function of ExtendedTaskOperations to track failed requests due to client errors and raise a CreateTasksErrorException if any occured.
* Elements of input template/json can be case insensitive.
* Escape in parameter json file doesn't need double escape.
* The callback of file operations include file name.

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* Rename the namespace to azext.batch