[FEA] Add stop detection algorithm

[gregory1506]

It would be useful if cuSpatial has the ability to detect when an object_id has stopped within a particular trajectory based on some defined duration and radius.

for example an API similar to:

import cuspatial as csp
df = "some trajectory dataframe(lat/lon) or geopandas GeoDataFrame"
stops = csp.find_stops(data=df, max_radius=m, min_duration=n)

alternative that is non GPU based are https://movingpandas.readthedocs.io/en/master/trajectorystopdetector.html

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