WIP: load_tile_map: Add the new parameter 'crs' to set the CRS of the returned dataarray

[seisman]

Description of proposed changes

Fixes #

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Reminders

• [ ] Run make format and make check to make sure the code follows the style guide.
• [ ] Add tests for new features or tests that would have caught the bug that you're fixing.
• [ ] Add new public functions/methods/classes to doc/api/index.rst.
• [ ] Write detailed docstrings for all functions/methods.
• [ ] If wrapping a new module, open a 'Wrap new GMT module' issue and submit reasonably-sized PRs.
• [ ] If adding new functionality, add an example to docstrings or tutorials.
• [ ] Use underscores (not hyphens) in names of Python files and directories.

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