An extension to add inspect method to Option and Result types.
```rust use respector::prelude::*;
assert_eq!(
Some(10).inspect(|x| println!("Some({})", x)),
Some(10)
); // Prints Some(10).
assert_eq!(
Ok::<_, ()>(10).inspect(|x| println!("Ok({})", x)),
Ok(10)
); // Prints Ok(10).
asserteq!(
Err::<(), _>(10).inspecterr(|x| println!("Err({})", x)),
Err(10)
); // Prints Err(10).
```