Upgrade builder-pattern-macro to syn v2 / bitflags v2 and align macro parsing APIs

[Copilot]

This update advances builder-pattern-macro dependency versions and adapts the derive macro implementation to current upstream APIs. The goal is to modernize dependency constraints while preserving existing macro behavior.

• Dependency upgrades

  • builder-pattern-macro/Cargo.toml
    • syn: 1.0 → 2
    • bitflags: 1.3 → 2

• syn v2 migration in macro parsing

  • Replaced deprecated/changed syn access patterns:
    • attr.path → attr.path()
    • VisPublic construction → parse_quote!(pub)
    • parse_meta/NestedMeta parsing path replaced with token parsing from attr.meta.require_list()
  • Updated setter attribute parsing to accept identifiers including Rust keywords used in attribute context (e.g. async) via Ident::parse_any.

• bitflags v2 compatibility

  • Added derives on Setters (Clone, Copy, PartialEq, Eq) to preserve operator/pattern usage semantics used across builder generation code.

• Clippy-oriented cleanup in touched paths

  • Removed unnecessary .into_iter() on ranges.
  • Canonicalized PartialOrd implementation (Some(self.cmp(other))).
  • Removed redundant .to_string() in format! args.
  • Improved setter parse failure messages with descriptive .expect(...).
  • Fixed doc-list continuation formatting in crate docs to satisfy current clippy rules.

// before (syn 1 style)
if attr.path.is_ident("setter") { ... }

// after (syn 2 style)
if attr.path().is_ident("setter") { ... }

Original prompt

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This section details on the original issue you should resolve

<issue_title>Upgrade dependency versions</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Upgrade dependency versions #30

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