feat: implement additional traits for nfs types

[Vaiz]

No description provided.

[Copilot]

Pull Request Overview

This PR implements additional traits for NFS3 types to improve ergonomics and reduce unnecessary cloning. The changes focus on adding Copy, Default, and Clone traits to various NFS3 types and updating code to utilize these new capabilities.

Key changes include:

• Adding Copy and Default traits to core NFS3 types like enums and small structs
• Implementing #[default] attributes on enum variants to specify default values
• Updating code to use direct assignment instead of cloning for Copy types

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
crates/nfs3_types/src/nfs3.rs	Adds Copy, Default, and Clone traits to NFS3 types with default enum variants
crates/nfs3_server/src/nfs_handlers.rs	Removes unnecessary clone operation for Copy type
crates/nfs3_server/src/memfs/mod.rs	Updates function signatures to use references and removes unnecessary clones

Comments suppressed due to low confidence (1)

crates/nfs3_types/src/nfs3.rs:987

• The enum name NFS_PROGRAM should follow Rust naming conventions and be PascalCase, e.g., NfsProgram instead of NFS_PROGRAM.

pub enum NFS_PROGRAM {