Expose HttpRequest and cdp modules as utils.

[garg3133]

This PR exposes a few internal modules like HttpRequest and cdp as utils so that these modules can be imported and used directly inside test suites.

HttpRequest module is useful for modifying the settings of HTTP requests as and when required. For example, we can modify the HTTP timeout and retry attempts for a particular command by calling the updateGlobalSettings static method just before that command:

HttpRequest.updateGlobalSettings({timeout: 10000, retry_attempts: 5});

Note: The above command would change the HttpRequest settings globally for the entirety of the test run. It should ideally be reset back to the original settings once the requirement is over.

Note 2: The initial values of timeout and retry_attempts can be set using the timeout_options property of webdriver config in nightwatch.conf.js.

cdp module is useful when working with CDP commands in Nightwatch -- there could be situations when users want to reset the CDP connection or reset the network mocks. They would also need this module when implementing their own custom CDP commands.

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