Splits a function identifier into its constituent parts: module address, module name, and function name.
This function helps in validating and extracting details from a function identifier string.
Parameters
functionArg: `${string}::${string}::${string}`
The function identifier string in the format "moduleAddress::moduleName::functionName".
Splits a function identifier into its constituent parts: module address, module name, and function name. This function helps in validating and extracting details from a function identifier string.