Fix ECC KeyPairGenerator bits to bytes conversion

[cconlon]

This PR fixes ECC KeyPairGenerator bits to bytes conversion. Java applications pass in key size in bits, but native wolfSSL expects key size in bytes.

JUnit test added for regression prevention.

This fixes OpenJDK SunJCE test: security/Signature/SignatureLength.java

[Copilot]

Pull Request Overview

This PR fixes a bug in the ECC KeyPairGenerator where key sizes specified in bits were incorrectly passed directly to the native wolfSSL library, which expects key sizes in bytes. The fix adds a conversion from bits to bytes for ECC key generation.

• Added bits-to-bytes conversion for ECC key sizes in the initialize method
• Added comprehensive JUnit test to verify the fix works for common ECC key sizes
• Added debug logging to help track ECC key generation parameters

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
WolfCryptKeyPairGenerator.java	Implements the bits-to-bytes conversion for ECC key sizes and adds debug logging
WolfCryptKeyPairGeneratorTest.java	Adds regression test to verify ECC key generation with standard bit sizes

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