perf: Cache schema resolve back to DSL

[ritchie46]

This will ensure that a program like this:

inital_q = my_lazy_frame_q...


for expr in my_exprs:
   result = initial_q.filter(expr).collect()

Will only resolve the schema of initial_q once. And subsequent loops will have resolved schema.

@stinodego this is similar to the path resolving case.

[ritchie46]

@kszlim together with the path resolving I think this should improve your use case.

[kszlim]

Awesome, thanks!