Adding customization for "events" processing to Http client

[quinnjr]

Checklist:

• If this PR is a new feature, please reference a discussion where a consensus about the design
  was reached (not necessary for small changes)
• Make sure all the significant new logic is covered by tests

About

Creating the ability to define in each request on the context input the different kinds of underlying Angular HttpClient options.

It is primarily suited to adding support for watching and 'event' of the HttpClient to determine events being emitted by the HttpClient as it processes the request/response.

Had to add the coercion of the FetchResult type to the SubscriptionResult type in subscription.ts or else Typescript was throwing errors for it.

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Latest commit: aee1c2e

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