Implement the Int 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 Int.

Describe the solution you'd like
Implement the functions in [elm/core Int](https://github.com/finos/morphir-elm/blob/main/src/Morphir/SDK/Int.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 by reading the referenced elm/core Int implementation in src/Morphir/SDK/Int.elm and inspect the repository for the corresponding Morphir SDK module and existing tests. Enumerate the Int functions that are missing, then add tests covering the implemented parity; done means the selected Int functionality is implemented and the tests pass.

Written by the indexing model from the issue text.