JSSE: implement WolfSSLPrincipal.toString() inside WolfSSLX509

[cconlon]

This PR addresses #280, and implements the toString() method inside WolfSSLPrincipal (implements java.security.Principal).

Additional JUnit tests are added here to verify behavior correctness, as well as behavior of default implies() method implementation from java.security.Principal. Since this default behavior works for us, there is no need to re-implement in WolfSSLPrincipal.

[Copilot]

Pull Request Overview

This PR adds a toString() override for WolfSSLPrincipal to return the same value as getName() and supplements it with JUnit tests verifying toString(), getName(), interface conformance, and the default implies() behavior.

• Added toString() in WolfSSLX509 principal implementation
• Introduced common test setup and multiple new JUnit tests in WolfSSLX509Test.java
• Adjusted test output indentation in existing tests

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/java/com/wolfssl/provider/jsse/WolfSSLX509.java	Implemented toString() to delegate to getName()
src/test/com/wolfssl/provider/jsse/test/WolfSSLX509Test.java	Added @Before setup and tests for principal methods; tweaked indentation

Comments suppressed due to low confidence (2)

src/test/com/wolfssl/provider/jsse/test/WolfSSLX509Test.java:410

• [nitpick] The indentation in these error/pass messages now uses three tabs, which differs from other tests—consider standardizing to a single tab for consistency.

                error("\t\t\t... failed");