Define a custom request-matching logic

What's Changed

• Improving coverage by @mindflayer in #301
• Fix for GIT URLs by @mindflayer in #302
• Better abstraction for when inheriting from mockhttp.Entry by @mindflayer in #305
• Define an alternative can_handle logic by passing a callable by @mindflayer in #306

Full Changelog: 3.13.10...3.13.11