Remove redundant WREQ module definition in error.rs

[Copilot]

Addresses feedback on #4 where src/error.rs redundantly called define_module for the WREQ module already defined in lib.rs.

Changes

• Removed redundant static: Deleted static WREQ: Lazy<RModule> that was redefining the module
• Updated macro: Changed define_exception! to use const_get() to look up the existing module instead of defining it
• Aligned function signature: Modified error::include() to accept gem_module parameter and return Result<(), MagnusError>, matching the pattern in http::include() and client::include()

Before:

static WREQ: Lazy<RModule> = Lazy::new(|ruby| ruby.define_module(crate::RUBY_MODULE_NAME).unwrap());

macro_rules! define_exception {
    ($name:ident, $ruby_name:literal, $parent:expr) => {
        static $name: Lazy<ExceptionClass> = Lazy::new(|ruby| {
            ruby.get_inner(&WREQ)
                .define_error($ruby_name, $parent(ruby))
                .unwrap()
        });
    };
}

pub fn include(ruby: &Ruby) { /* ... */ }

After:

macro_rules! define_exception {
    ($name:ident, $ruby_name:literal, $parent:expr) => {
        static $name: Lazy<ExceptionClass> = Lazy::new(|ruby| {
            let wreq_module: RModule = ruby.class_object().const_get(crate::RUBY_MODULE_NAME).unwrap();
            wreq_module.define_error($ruby_name, $parent(ruby)).unwrap()
        });
    };
}

pub fn include(ruby: &Ruby, _gem_module: &RModule) -> Result<(), MagnusError> { /* ... */ }

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