Implement the ResultList Module of the Morphir SDK

Is your feature request related to a problem? Please describe.
Morphir's SDK seeks to have parity with much of elm/core and should have full parity with elm/core ResultList.

Describe the solution you'd like
Implement the functions in [elm/core ResultList](https://github.com/finos/morphir-elm/blob/main/src/Morphir/SDK/ResultList.elm) and add tests. Over time we will add more functionality here, but this is a good start.

Describe alternatives you've considered
N/A

Additional context
N/A

Start with the linked elm/core ResultList.elm implementation and locate the corresponding Morphir SDK module in this repository. Compare the available functions, implement the requested parity, and add tests covering the implemented behavior; done means the module functions and tests are present.

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