Add wrapper for wolfSSL_SNI_GetFromBuffer()

[cconlon]

This PR adds a static WolfSSL.getSNIFromBuffer() method, wrapping native wolfSSL_SNI_GetFromBuffer(), allowing SNI extraction from a raw ClientHello buffer without requiring an SSL context or session.

Also adds JUnit test with mock TLS 1.2 ClientHello containing SNI.

ZD 21200

[Copilot]

Pull request overview

This PR adds a JNI wrapper for the native wolfSSL_SNI_GetFromBuffer() function, enabling extraction of Server Name Indication (SNI) from raw ClientHello buffers without requiring an SSL context or session. This is useful for SNI-based routing scenarios where the server needs to inspect the SNI before establishing the TLS session.

Changes:

• Added WolfSSL.getSNIFromBuffer() static native method for extracting SNI from ClientHello buffers
• Implemented corresponding JNI native function with proper parameter validation and error handling
• Added comprehensive JUnit test with hand-crafted TLS 1.2 ClientHello message

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/java/com/wolfssl/WolfSSL.java	Added public static native method getSNIFromBuffer() with JavaDoc documentation
native/com_wolfssl_WolfSSL.h	Added JNI function declaration for the new method
native/com_wolfssl_WolfSSL.c	Implemented JNI wrapper with parameter validation, memory management, and exception handling for both HAVE_SNI and non-SNI builds
src/test/com/wolfssl/test/WolfSSLTest.java	Added test method that constructs a minimal TLS 1.2 ClientHello with SNI and validates extraction, including null parameter tests

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