Initial Checks

• I have searched Google & GitHub for similar requests and couldn't find anything
• I have read and followed the docs and still think this feature is missing

Description

A method to correctly join URLs:

>>> a = Url("https://example.com/")

>>> a.join("user/John")
Url('https://example.com/user/John')

>>> a.join("/user/John")
Url('https://example.com/user/John')

>>> a / "user" / "John" # Similar to pathlib's __truediv__? Would be quite neat but may be too confusing?
Url('https://example.com/user/John')

This would be really helpful when dealing with URLs, so you don't have to keep a track of / on your own.

Affected Components

• Compatibility between releases
• Data validation/parsing
• Data serialization - .model_dump() and .model_dump_json()
• JSON Schema
• Dataclasses
• Model Config
• Field Types - adding or changing a particular data type
• Function validation decorator
• Generic Models
• Other Model behaviour - model_construct(), pickling, private attributes, ORM mode
• Plugins and integration with other tools - mypy, FastAPI, python-devtools, Hypothesis, VS Code, PyCharm, etc.