Support for unix abstract sockets

[hexfusion]

Feature Request

#861 added support for unix domain sockets but it doesn't appear to support abstract sockets. Rust added abstract namespace support recently rust-lang/rust#85379 and I was curious if there was a workaround or general timeline for adding this support.

Motivation

As a multi lang gRPC developer I would like to utilize abstract sockets which are supported in other languages for example grpc-go[1].

[1] https://github.com/grpc/grpc-go/tree/v1.45.x/examples/features/unix_abstract

[hexfusion]

cc @LucioFranco it appears that you reviewed the original PR. Thanks in advance.

[LucioFranco]

I would imagine we first need to implement this in tokio then it should be possible to support this in tonic.