chore: suppress clippy::ignored_unit_patterns in generated match expressions

[Copilot]

The macro generates match patterns like Ok(_) and Some(_) which trigger clippy's ignored_unit_patterns lint when the inner type is (). This occurs with functions returning Result<(), E> or Option<()>.

Changes

• Added #[allow(clippy::ignored_unit_patterns)] to generated match statements in gen_result_label_block and gen_option_label_block (4 locations total - async/sync branches for each)
• Added test coverage for Result<(), E> and Option<()> return types with pedantic lints enabled

Example

#[logcall(ok = "debug", err = "error")]
pub async fn start() -> Result<(), String> {
    Ok(())
}

Previously triggered: warning: matching over () is more explicit on the function signature line when compiled with #[warn(clippy::pedantic)].

Original prompt

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This section details on the original issue you should resolve

<issue_title>In certain case, logcall triggers clippy warning.</issue_title>
<issue_description>For function like this:

#[logcall(ok = "debug", err = "error")]
pub async fn start(&self) -> anyhow::Result<()> {
    // some other codes
    Ok(())
}

A note from clippy on the fn line.

matching over `()` is more explicit
for further information visit https://rust-lang.github.io/rust-clippy/beta/index.html#ignored_unit_patterns
`#[warn(clippy::ignored_unit_patterns)]` implied by `#[warn(clippy::pedantic)]`
```</issue_description>

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

<comments>
</comments>

• Fixes In certain case, logcall triggers clippy warning. #19

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[andylokandy]

@copilot change to deny

[andylokandy]

Alright...