uvloop is broken for abstract sockets - create_unix_connection does not work for abstract sockets as libuv does not support them

• uvloop version: master
• Python version: 3.10+
• Platform: unix
• Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: yes
• Does uvloop behave differently from vanilla asyncio? How?: yes

uvloop:
tr = UnixTransport.new(self, protocol, None, waiter, context)
tr.connect(path) <--- uses uv_pipe_connect which uses uv__strscpy which assumes zero terminated string

asyncio:
sock_connect -> getsockaddrarg (in socketmodule.c) which uses memcpy

I have raised this with libuv as issue: https://github.com/libuv/libuv/discussions/3911

从 create_unix_connection 和所示的 UnixTransport.new/tr.connect(path) 路径开始，然后将其与 vanilla asyncio 对 socket_connect 的处理进行比较。在决定修复应归属于 uvloop 还是 libuv 之前，阅读链接的 libuv 关于抽象 socket 的讨论。抽象 Unix socket 连接能够按预期工作，并且已通过与 asyncio 对照验证其行为，即视为完成。