Support generic function parameter

[Schroefdop]

Function to mock:

    func createFile<T: Encodable>(
        fileName: String,
        in directory: FileStorage.DirectoryType,
        contents object: T?
    ) -> Bool

Output from generator:

    public var invokedCreateFile: Bool { invokedCreateFileCount > 0 }
    public var invokedCreateFileCount = 0
    public var invokedCreateFileParameters: (fileName: String, directory: FileStorage.DirectoryType, object: T?)?
    public var invokedCreateFileParametersList: [(fileName: String, directory: FileStorage.DirectoryType, object: T?)] = []
    public var stubbedCreateFileResult: Bool!
    public var invokedCreateFileExpectation = XCTestExpectation(description: "\(#function) expectation")
    @discardableResult

    public func createFile<T: Encodable>(fileName: String, in directory: FileStorage.DirectoryType, contents object: T?) -> Bool {
        defer { invokedCreateFileExpectation.fulfill() }
        invokedCreateFileCount += 1
        invokedCreateFileParameters = (fileName: fileName, directory: directory, object: object)
        invokedCreateFileParametersList.append((fileName: fileName, directory: directory, object: object))
        return stubbedCreateFileResult
    }

In the invokedCreateFileParameters and invokedCreateFileParametersList the function parameter object is generated with type T?, this should be Encodable

[Schroefdop]

We probably have to check closure parameters too

[Schroefdop]

Also the @discardablerResult annotation is placed in a weird way now that i see it