Column name parsing fail for multiple-dot names

[hombit]

Bug report

I have a column name "R.A." and lsdb.from_dataframe() fails

File /ocean/projects/phy210048p/malanche/lsdb-tests/cenv/lib/python3.11/site-packages/nested_pandas/nestedframe/core.py:58, in NestedFrame._is_known_hierarchical_column(self, colname)
     56 """Determine whether a string is a known hierarchical column name"""
     57 if "." in colname:
---> 58     left, right = colname.split(".")
     59     if left in self.nested_columns:
     60         return right in self.all_columns[left]

ValueError: too many values to unpack (expected 2)

We probably should count dots or unpack it safer, e.g. with left, right, *others = colname.split(".")

Before submitting
Please check the following:

• I have described the situation in which the bug arose, including what code was executed, information about my environment, and any applicable data others will need to reproduce the problem.
• I have included available evidence of the unexpected behavior (including error messages, screenshots, and/or plots) as well as a descriprion of what I expected instead.
• If I have a solution in mind, I have provided an explanation and/or pseudocode and/or task list.