Port `DynamicFilterPhysicalExpr` to use `try_to_proto` / `try_from_proto`

[adriangb]

Sub-issue of #22418. Port DynamicFilterPhysicalExpr to use the try_to_proto / try_from_proto hooks added in #21929.

Replace the DynamicFilterPhysicalExpr arm in datafusion/proto/src/physical_plan/{to_proto,from_proto}.rs with try_to_proto / try_from_proto impls next to DynamicFilterPhysicalExpr. See the Column / BinaryExpr migrations in #21929 for reference.

Also revert the pub-for-proto scaffolding from #21807 (Inner, from_parts, inner(), original_children, remapped_children) once decode reads the state directly.

[AnuragRaut08]

Hi @adriangb, I'd like to work on this.

I'll wait for #21929 to land and then port DynamicFilterPhysicalExpr following the same Column / BinaryExpr migration pattern.

I’ll also handle reverting the pub-for-proto scaffolding mentioned in the issue once decode reads the state directly.

[adriangb]

Great, I've assigned this to you!