feat: basic support for SQL SELECT -> ExtendedExpression

[amol-]

This allows to compile basic SQL SELECT statements to ExtendedExpressions,
the goal is to handle pyarrow Dataset support for ExtendedExpressions
in Projections and Filtering of Datasets.

This can act as a starting for future support of more advanced features,
like subqueries and entire Substrait Plans,
for the moment the goal is just to support what pyarrow.Expressions
can represent

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[amol-]

I just imported this from an experiment, it's far from being done. I need to refactor and further improve it.

Here is a reference to the kind of operations I'm aiming at supporting: https://arrow.apache.org/docs/python/generated/pyarrow.dataset.Expression.html#pyarrow.dataset.Expression

• Compare fields and literals with <, <=, ==, >=, >
• Combine expressions using logical and, logical or and logical not
• Support is_nan
• Support is_valid (IS NULL, IS NOT NULL)
• Support is_in (list of literals)
• Handle custom types in ExtendedExpressions schema (arrow declares its own types)