Detect and translate ADQL that is only gathering statistics

[gitosaurus]

Feature request

The ADQL:

SELECT MIN(ra) AS ra_min, MAX(ra) AS ra_max, MIN(dec) AS dec_min, MAX(dec) AS dec_max FROM ppdb.DiaObject"

can be translated to LSDB as:

ppdb.aggregate_column_statistics(include_columns=["ra","dec"])[["min_value", "max_value"]]

There's a lot of pattern matching to do here, since MIN and MAX are simply ADQL functions and might be mixed with other arithmetic for other purposes. But this particular purpose, to gather statistics on a subset of columns, is common enough to look for it specifically. The translator will need to determine:

1. That the statistical functions are all that are in the SELECT clause
2. That the functions are all available in .aggregate_column_statistics
3. The underlying original column names

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