Derive Clone trait for Sqids struct

[Kab1r]

Add Clone trait to Sqids struct

This pull request introduces the Clone trait to the Sqids struct, allowing for copying of squid generators.

Changes:

• The #[derive(Clone, Debug, Builder)] attribute is added to the Sqids struct definition, enabling the automatic implementation of the Clone trait alongside the existing Debug and Builder traits.

Benefits:

• Simplified usage: Code using Sqids can now easily create independent copies.

[4kimov]

Thank you!