Fix Proxy Method Handling (toString, equals, hashCode) in OS Signal handling

[Saturn225]

This PR resolves an issue where the Signal.scala implementation caused a stack overflow during signal handling. The issue arises because java.lang.reflect.Proxy was used for signal handling and default methods (toString, equals, hashCode) were not explicitly handled. As a result, Calls to toString on the proxy object led to recursive invocations as reported in the issue and reproducer

This fix draws from established practices for proxy behavior:

Implementing equals, hashCode and toString for Proxies

The fix adheres to Java's expectations and prevented recursion by ensuring these methods are handled directly in the InvocationHandler

/claim #9321
Fixes #9321

Let me know any for clarifications of my solution or any suggestion or feedback to incorporate

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[Saturn225]

@jdegoes Can have any reviews on this PR?

[kyri-petrou]

I'm quite sceptical on whether this indeed a fix to the linked issue. The issue exists only for Windows platforms but this PR doesn't really change anything specific to Windows. Can you please explain how does it solve the issue, as well as screenshots / videos that it indeed fixes the issue when running an application on a Windows machine?

[Saturn225]

@kyri-petrou This fix is related of StackOverflow issue recorded in reproducer. I thought from logs this is due to shift in 2.1.12 the Signal Handling from ZIO specific to JAVA Signal Hadler

Exception in thread "SIGINT handler" java.lang.StackOverflowError
	at zio.internal.Signal$SignalHandler$SunMiscSignalHandler.$anonfun$initInvocationHandler$1(Signal.scala:114)
	at jdk.proxy2/jdk.proxy2.$Proxy2.toString(Unknown Source)
	at java.base/java.lang.StringConcatHelper.stringOf(StringConcatHelper.java:453)
	at zio.internal.Signal$SignalHandler$SunMiscSignalHandler.$anonfun$initInvocationHandler$1(Signal.scala:114)
	at jdk.proxy2/jdk.proxy2.$Proxy2.toString(Unknown Source)
	at java.base/java.lang.StringConcatHelper.stringOf(StringConcatHelper.java:453)
	at zio.internal.Signal$SignalHandler$SunMiscSignalHandler.$anonfun$initInvocationHandler$1(Signal.scala:114)
	at jdk.proxy2/jdk.proxy2.$Proxy2.toString(Unknown Source)
	...