[Refactoring] Refactor Expect methods

[siller174]

Reimplement these methods like Require and Assert, e.g. ExpectJSONSchemaString => AssertJSONSchemaString and RequireJSONSchemaString

func (qt *cute) ExpectExecuteTimeout(t time.Duration) ExpectHTTPBuilder {
	qt.tests[qt.countTests].Expect.ExecuteTime = t

	return qt
}

func (qt *cute) ExpectStatus(code int) ExpectHTTPBuilder {
	qt.tests[qt.countTests].Expect.Code = code

	return qt
}

func (qt *cute) ExpectJSONSchemaString(schema string) ExpectHTTPBuilder {
	qt.tests[qt.countTests].Expect.JSONSchema.String = schema

	return qt
}

func (qt *cute) ExpectJSONSchemaByte(schema []byte) ExpectHTTPBuilder {
	qt.tests[qt.countTests].Expect.JSONSchema.Byte = schema

	return qt
}

func (qt *cute) ExpectJSONSchemaFile(filePath string) ExpectHTTPBuilder {
	qt.tests[qt.countTests].Expect.JSONSchema.File = filePath

	return qt
}