pygmt.grdtrack: Add 'output_type' parameter for output in pandas/numpy/file formats

[seisman]

Description of proposed changes

Same as #3103 but for grdtrack.

Preview: https://pygmt-dev--3106.org.readthedocs.build/en/3106/api/generated/pygmt.grdtrack.html#pygmt.grdtrack

Benchmarks:

>>> import pygmt
>>> points = pygmt.datasets.load_sample_data(name="ocean_ridge_points")
>>> for inc in ["30m", "10m", "06m"]:
...     %timeit df = pygmt.grdtrack(points=points, grid=f"@earth_relief_{inc}_g", newcolname="bathymetry")
...

Main branch:

20.5 ms ± 154 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
57.6 ms ± 227 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
139 ms ± 268 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)

This branch:

14.1 ms ± 3.08 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
49.1 ms ± 174 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)
130 ms ± 161 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)

[yvonnefroehlich]

Suggested change

	- None if ``outfile`` is set (output will be stored in file set by ``outfile``)
	- :class:`pandas.DataFrame` or :class:`numpy.ndarray` if ``outfile`` is not set
	(depends on ``output_type``)
	- ``None`` if ``outfile`` is set (output will be stored in file set by ``outfile``)
	- :class:`pandas.DataFrame` or :class:`numpy.ndarray` if ``outfile`` is not set
	(depends on ``output_type``)