feat: plan-time SQL expression simplifying #19312
Description
Is your feature request related to a problem or challenge?
Some SQL constructs require parsing numeric expressions at plan-time, so planners must use a literal. For example, SELECT * FROM TABLE SAMPLE (10 + 50 * 2), window functions. In #17843, there is a custom function eval_numeric_expr to make a tree traversal to resolve a literal. It would be nice to have a reusable function in core.
Describe the solution you'd like
A generic reusable function module for parsing and simplifying an SQL expression to a literal of a given type.
Describe alternatives you've considered
No response
Additional context
No response