Enable the io_uring UDS and sendfile implementations.

[dreamlike-ocean]

Motivation:

Enable the io_uring UDS and sendfile implementations

Current Netty io_uring transport already fully provides sendfile and Unix domain socket functionality. This PR enables Vert.x support for these features.
1. io.vertx.core.impl.transports.IoUringTransport#supportsDomainSockets will always return true, and io.vertx.core.impl.transports.IoUringTransport#configure(io.vertx.core.net.TcpOptions, boolean, io.netty.bootstrap.ServerBootstrap) and io.vertx.core.impl.transports.IoUringTransport#configure(io.vertx.core.net.TcpOptions, boolean, io.netty.bootstrap.Bootstrap) are adjusted to support Unix domain sockets.
2. io.vertx.core.impl.transports.IoUringTransport#supportFileRegion: if the current Linux kernel supports IORING_OP_SPLICE and it is not disabled by system parameters, sendfile support is enabled.
3. Due to performance issues with io_uring splice (see netty/netty#15747), support is added to forcibly disable io_uring sendfile via a system parameter.
4. Introduce UncloseableFileRegion to replace the current DefaultFileRegion in Vert.x code, preventing resource leaks caused by non-zero reference counts. fix #5743

Conformance:

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[dreamlike-ocean]

Additionally, regarding advanced features supported by Netty io_uring such as BufferGroup read and sendzc, I believe users can implement them manually, for example, in the following way.
https://gist.github.com/dreamlike-ocean/38d8e62c043018f1ab4dd872414a0b33