Release Prep and Fixes

[cconlon]

This PR includes fixes made as part of release testing:

• Removes -framework JavaVM from java.sh. This breaks on newer OSX / XCode versions and doesn't appear to be necessary even for older versions. Tested on OSX 12.1 (Monterey) and on older OSX 10.15.5 (Catalina).
• Fixes Javadoc warnings on newer versions of Java. Tested on OSX with Java 18.
• Modifies example KeyStore files to be more specific to type/size of certificates contained. Allows for more granular and specific testing. Updates Android convert-to-bks.sh script to apply these changes to Android environments.
• Fixes compiler warnings when HAVE_PK_CALLBACKS is not defined for native wolfSSL. In native wolfSSL, this define was excluded from the build recently for FIPS builds of wolfSSL.
• Improves output of java.sh by printing out OS/ARCH.
• Modifies WolfSSLCertificate.toString() to allow Java to do the modified UTF-8 string conversion. Now returns simple byte array from native wrapper.
• Update example certificates in examples/certs to match current wolfSSL. Also updates WolfSSLCertificateTest cases for the newer certs.
• Updates Android Studio project gradle version to 7.1.3.
• Updates README.md with release notes for upcoming release.