pygmt.select: Add aliases for "C", "F", and "L"

[yvonnefroehlich]

Description of proposed changes

This PR aims to add aliases for pygmt.select:

• C -> pointfile dist2pt
• F -> polygonfile polygon
• L -> line_file dist2line

The aliases are currently based on the Julia documentation at
https://joa-quim.github.io/GMTjl_doc/documentation/modules/gmtselect/index.html.

Preview: https://pygmt-dev--2466.org.readthedocs.build/en/2466/api/generated/pygmt.select.html

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.

Slash Commands

You can write slash commands (/command) in the first line of a comment to perform
specific operations. Supported slash commands are:

• /format: automatically format and lint the code
• /test-gmt-dev: run full tests on the latest GMT development version

[yvonnefroehlich]

/format

[weiji14]

Thanks @yvonnefroehlich!