Accept pathlib.Path objects in path arguments.

[aaugustin]

This was already working in the asyncio and trio implementations because
we're relying on high-level helpers that already support such objects.
Changes were only necessary for the threading implementation.

[Copilot]

Pull request overview

Adds pathlib.Path support to Unix socket path arguments across implementations.

Changes:

• Introduces a shared PathLike type.
• Updates Unix client, server, and router signatures.
• Adds tests and documentation.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/websockets/typing.py	Defines PathLike.
src/websockets/asyncio/client.py	Updates client path typing.
src/websockets/asyncio/server.py	Updates server path typing.
src/websockets/asyncio/router.py	Updates router path typing.
src/websockets/sync/client.py	Normalizes client paths.
src/websockets/sync/server.py	Normalizes server paths.
src/websockets/sync/router.py	Updates router path typing.
src/websockets/trio/client.py	Updates client path typing.
tests/asyncio/test_client.py	Tests Path client connections.
tests/asyncio/test_server.py	Tests Path server sockets.
tests/sync/test_client.py	Tests threading client support.
tests/sync/test_server.py	Tests threading server support.
tests/trio/test_client.py	Tests Trio client support.
docs/reference/types.rst	Documents PathLike.
docs/project/changelog.rst	Records path-like support.

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