Add error types

[thebuilder]

This improves the error types as outlined in #483.

It allows you to define the expected type of an error, while defaulting to Error.

useQuery<TResult, TKey, TVariables, TError>()

Todo

[ ] Add appropriate type tests

Question

Currently running dtslint creates a few warnings. Are these expected?
After adding TError to prefetch methods, I've also generated a few more warnings about unnecessary generics (https://github.com/Microsoft/dtslint/blob/master/docs/no-unnecessary-generics.md).

ERROR: 621:44  no-unnecessary-generics  Type parameter TError is used only once. See: https://github.com/Microsoft/dtslint/blob/master/docs/no-unnecessary-generics.md
ERROR: 632:44  no-unnecessary-generics  Type parameter TError is used only once. See: https://github.com/Microsoft/dtslint/blob/master/docs/no-unnecessary-generics.md
ERROR: 649:44  no-unnecessary-generics  Type parameter TError is used only once. See: https://github.com/Microsoft/dtslint/blob/master/docs/no-unnecessary-generics.md
ERROR: 661:44  no-unnecessary-generics  Type parameter TError is used only once. See: https://github.com/Microsoft/dtslint/blob/master/docs/no-unnecessary-generics.md
ERROR: 683:44  no-unnecessary-generics  Type parameter TError is used only once. See: https://github.com/Microsoft/dtslint/blob/master/docs/no-unnecessary-generics.md
ERROR: 686:57  no-unnecessary-generics  Type parameter T is used only once. See: https://github.com/Microsoft/dtslint/blob/master/docs/no-unnecessary-generics.md
ERROR: 701:14  no-unnecessary-generics  Type parameter TResult is used only once. See: https://github.com/Microsoft/dtslint/blob/master/docs/no-unnecessary-generics.md

[tannerlinsley]

🎉 This PR is included in version 1.5.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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