When generating API stubs with the scaffold utility using, e.g., `python -m localstack.aws.scaffold sns`,
the scaffold creates method names from operation names, which are ugly when acronyms (subsequent uppercase characters that belong together).

Example:
`CreateSMSSandboxPhoneNumber` -> `create_s_m_s_sandbox_phone_number`

it would be nicer to have `create_sms_sandbox_phone_number`

This is a limitation of this method: https://github.com/localstack/localstack/blob/1888e66b85d7e6a8ee457bc7a732984fcf7aa830/localstack/utils/common.py#L978-L979
content = """
        1: {search}
        2: {search}
        3: {sear}
        """
        expected = """
        1: foo
        2: foo
        3: {sear}
        """
        fp = tmp_path / "file.txt"
        fp.write_text(content)
        common.replace_in_file("{search}", "foo", fp)
        assert fp.read_text() == expected
        
        common.replace_in_file("{search}", "foo", fp)
        assert fp.read_text() == expected
    def test_replace_in_file_with_non_existing_path(self, tmp_path):