add row count for conditional_join

[samukweku]

Brief Description

add a row count for matches from the left dataframe in the right dataframe

Example API

(d2
.conditional_join(
    d1, 
    ('pos', 'segment.start', '>='), 
    ('pos', 'segment.end', '<='),
    ('chr', 'chr', '=='), 
    return_counts=True)
)