Lowercase and CamelCase checking of module imports in UMDP3 checker

During the runtime of umdp3_conformance.py it was noted that changing module imports to be uppercase did not result in a failure being registered in the output of the script as expected. umdp3_conformance.py calls the following code in umdp3_checker_rules.py

    def lowercase_variable_names(self, lines: List[str]) -> TestResult:
        """Check for lowercase or CamelCase variable names only"""
        """
    TODO: This is a very simplistic check and will not detect many
        cases which break UMDP3. I suspect the Perl Predecessor concatenated
        continuation lines prior to 'cleaning' and checking. Having identified
        a declaration, it also then scanned the rest of the file for that
        variable name in any case."""
        failures = 0
        error_log = {}
        count = -1
        for count, line in enumerate(lines):
            clean_line = self.remove_quoted(line)
            clean_line = re.sub(r"!.*$", "", clean_line)

            # Simple check for UPPERCASE variable declarations
            if re.search(
                r"^\s*(INTEGER|REAL|LOGICAL|CHARACTER|TYPE)\s*.*::\s*[A-Z_]+",
                clean_line,
                re.IGNORECASE,
            ):
                clean_line = re.sub(
                    r"^\s*(INTEGER|REAL|LOGICAL|CHARACTER|TYPE)\s*.*::\s*",
                    "",
                    clean_line,
                )
                if match := re.search(r"([A-Z]{2,})", clean_line):
                    self.add_extra_error(f"UPPERCASE variable name : {match[1]}")
                    failures += 1
                    error_log = self.add_error_log(
                        error_log, f"UPPERCASE variable name {match[1]}", count +1
                    )

        output = f"Checked {count + 1} lines, found {failures} failures."
        return TestResult(
            checker_name="Lowercase or CamelCase variable names only",
            failure_count=failures,
            passed=(failures == 0),
            output=output,
            errors=error_log,
        )

addressing this issue will involve a refactor of this function to ensure module level imports are checked.