Catalog self crossmatches fail due to suffix defaults

[dougbrn]

Bug report
The following simple example fails with ValueError: cannot reindex on an axis with duplicate labels:

import lsdb
cat = lsdb.generate_catalog(5000,100, lowest_order=4, ra_range=(15.0,25.0), dec_range=(34.0,44.0), seed=1)
cat.crossmatch(cat).compute()

This is due to the default suffix behavior causing collisions, so the suffixes need to be manually provided:
cat.crossmatch(cat, suffixes=("_l", "_r")).compute()

This should work by default, ideally. We could check for suffix collision and append (_l, _r) to them, for example

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• I have described the situation in which the bug arose, including what code was executed, and any applicable data others will need to reproduce the problem.
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• I have included available evidence of the unexpected behavior (including error messages, screenshots, and/or plots) as well as a description of what I expected instead.
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