CAMEL-19270 - camel-netty - add support for unix domain sockets

[iMashtak]

Description

PR brings support for usage of unix domain socket as an alternative to inet socket.

Summary

• New config property unixDomainSocketPath
• If property set, host and port becomes unneccessary - similar case to curl --unix-socket option - you need to set host and port but they are ignored
• Tested using clientMode=true, with no success (i took NettyConsumerClientModeTest as an example) - it just does not work as expected, so i didn't add changes to ClientModeTCPNettyServerBootstrapFactory and mention that case in docs
• Changed only TCP-related classes, not UDP

Target

• I checked that the commit is targeting the correct branch (note that Camel 3 uses camel-3.x, whereas Camel 4 uses the main branch)

Tracking

• If this is a large change, bug fix, or code improvement, I checked there is a JIRA issue filed for the change (usually before you start working on it).

Apache Camel coding standards and style

• I checked that each commit in the pull request has a meaningful subject line and body.

• I formatted the code using mvn -Pformat,fastinstall install && mvn -Psourcecheck

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Components tested:

Total	Tested	Failed ❌	Passed ✅
1	1	0	1