Add project parameter extensions for Document

[AleksandrFomenko]

Summary of the Pull Request

What is this about:

Adds extension methods for working with project parameters bound in a document.

Description:

New extensions:

• document.GetProjectParameterNames(ParameterBindingKind) — names of all bound project parameters, optionally filtered by binding kind (instance/type/any)
• document.GetProjectParameterNames(BuiltInCategory, ParameterBindingKind) — filtered by category
• document.GetProjectParameterNames(ForgeTypeId, ParameterBindingKind) — filtered by data type (Revit 2021+)
• document.GetProjectParameterDefinition(string) — finds a project parameter definition by name

A new [Flags] enum ParameterBindingKind controls instance/type binding filtering.

The ForgeTypeId overload is gated behind #if REVIT2021_OR_GREATER; for 2019–2020 a ParameterType overload is provided instead. Category matching uses Category.BuiltInCategory on 2023+ and falls back to Id.IntegerValue on earlier versions.

Quality Checklist

• [галочка)] My code follows the style guidelines of this project
• [галочка)] I have performed a self-review of my own code
• [галочка)] I have made corresponding changes to the documentation
• [галочка)] My changes generate no new warnings

[AleksandrFomenko]

😺