feat(core): add DynamicParameterBinding support to Plan POJO

[bvolpato]

Summary

Add support for DynamicParameterBinding handling at the plan level, as a follow-up to #752 (which added expression-level DynamicParameter support).

Background

The Substrait spec defines DynamicParameterBinding as a plan-level message that maps a parameter_anchor to a runtime literal value. This allows plans with DynamicParameter expression placeholders to be executed with concrete values without re-planning.

message DynamicParameterBinding {
  uint32 parameter_anchor = 1;
  Expression.Literal value = 2;
}

The Plan message has a repeated DynamicParameterBinding parameter_bindings = 7 field that is currently not represented in the substrait-java Plan POJO.

Scope

1. Plan.java: Add List<DynamicParameterBinding> field (as an @Value.Immutable inner class or standalone)
2. PlanProtoConverter: Serialize bindings from POJO → Proto
3. ProtoPlanConverter: Deserialize bindings from Proto → POJO
4. Type validation: Validate that each binding's literal type matches the type of the corresponding DynamicParameter expression in the plan (similar to what substrait-go does with ValidateParameterBindings)
5. Tests: Proto roundtrip tests and validation tests

References

• Depends on: feat(core,isthmus): add DynamicParameter expression support #752
• substrait-go reference implementation: DynamicParameterBinding, ValidateParameterBindings, PlanWithBindings
• Proto definition: plan.proto#L101