Azure Event Grid: Consolidated event subscription operations into a single category, and added support for update commands.

[kalyanaj]

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• BC: Removed the az eventgrid topic event-subscription commands. The corresponding az eventgrid event-subscription commands can now be used to manage event subscriptions for topics.
• BC: Removed the az eventgrid resource event-subscription commands. The corresponding az eventgrid event-subscription commands can now be used to manage event subscriptions for Azure resources.
• BC: Removed the az eventgrid event-subscription show-endpoint-url command. This can now be achieved using az eventgrid event-subscription show command with the --include-full-endpoint-url parameter.
• Added a new command az eventgrid topic update.
• Added a new command az eventgrid event-subscription update.
• Added --ids parameter for az eventgrid topic commands.
• Added tab completion support for topic names.

This checklist is used to make sure that common guidelines for a pull request are followed.

General Guidelines

• The PR has modified HISTORY.rst describing any customer-facing, functional changes. Note that this does not include changes only to help content. (see Modifying change log).

Command Guidelines

• Each command and parameter has a meaningful description.
• Each new command has a test.

(see Authoring Command Modules)

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