NewEIFunctions constructs a new empty `EIFunctions`.

NewImportedFunctionError constructs a new `ImportedFunctionError`, where `functionName` is the name of the imported function, and `message` is the error message.

EIFunction represents a EI function that gets imported in a constract WASM module.

EIFunctions holds a collection of EI functions.

ImportedFunctionError represents any kind of errors related to a WebAssembly imported function.

EIFunctionReceiver abstracts an EI imports container, where EI functions are registered.

EIFunctionValue represents EI argument types.