[test] Add unit tests for formatting utility functions

[adity1raut]

Related Issue / Discussion:

Fixes Issue #XX

Changes:

• New tests/test_formatting.py

Summary:

Before: WeatherRoutingTool/utils/formatting.py had zero test coverage.
After: 13 unit tests covering get_line_string, get_log_step,
get_point_from_string, and get_bbox_from_string, grouped into
pytest classes. Tests are pure unit tests with no I/O or fixtures needed.

Dependencies:

None.

PR Checklist:

In the context of this PR, I:

• have (already previously) filled the 52North Contributor License Agreement and received positive feedback on this matter
• have filled the 52North Contributor License Agreement and am waiting for feedback
• provide unit tests embedded in the WRT test framework (WeatherRoutingTool/tests) that allow the simple testing of the new/modified functionalities. All (previous and new) unit tests execute without new error messages.
• ensure that the code formatter runs without errors/warnings
• ensure that my changes follow the WRT’s guidelines for contributing at the time of the contribution

Please consider that PRs which do not meet the requirements specified in the checklist will not be evaluated. Also, PRs with no activities will be closed after a reasonable amount of time.

[kdemmich]

Hi @adity1raut, thank you for your PR. We appreciate the time and effort that was put into it. In the PR template checklist, please ensure that your changes follow the WRT guidelines for contributors. Then, we will review your PR.