Add type hints for GMT anchor codes #3459
Merged
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Description of proposed changes
This PR adds typing hints for the GMT anchor codes like TL/TR.
The new module
pygmt._typing
is inspired by https://github.com/numpy/numpy/tree/main/numpy/_typing and https://github.com/pandas-dev/pandas/blob/main/pandas/_typing.py.In GMT, the order of horizontal and vertical alignments doesn't matter, so both TL and LT are accepted, but here only codes like TL are added to avoid making the function signature to long.