[EPIC] Expose all operators and expressions in Python

[andygrove]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
I would like Python users to be able to access all operators and expressions in the logical plan.

This enables the mapping of plans to DataFrame libraries, as demonstrated in #190

Describe the solution you'd like
Gotta implement them all.

Operators

• TableScan - Table scan bindings #178
• Projection - Add bindings for Projection #180
• Filter - Add Python wrapper for LogicalPlan::Filter #192
• Limit - Add Python wrapper for LogicalPlan::Limit #193
• Sort - Add Python wrapper for LogicalPlan::Sort #196
• Aggregate - Add Python wrapper for LogicalPlan::Aggregate #195
• Join
• Union
• Repartition
• Subquery

Expressions

• Column - Add experimental support for executing SQL with Polars and Pandas #190
• Literal - Add experimental support for executing SQL with Polars and Pandas #190
• Binary Expression - Add experimental support for executing SQL with Polars and Pandas #190
• Standard Aggregate Functions (min, max, count, etc) - Add experimental support for executing SQL with Polars and Pandas #190
• Sort Expressions
• Case When
• IsNull / IsNotNull
• IsTrue / IsFalse
• InList
• Cast
• Window function
• UDF / UDAF

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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