Add wolfJCE WKS KeyStore Support

[cconlon]

This PR adds support for using wolfJCE's WKS KeyStore type, which is in review on wolfcrypt-jni here (wolfSSL/wolfcrypt-jni#67). Specifically this PR:

• Gives preference to try and load WKS KeyStore type first before falling back to try and load others (BKS, JKS, etc).
• When auto-loading the system CA/root certificates (ex: jssecacerts, cacerts), wolfJSSE first tries to find and load a WKS equivalent file at the same location (ex: jssecacerts.wks, cacerts.wks)
• New Security property added (wolfjsse.keystore.type.required) which can be used to restrict use of KeyStore type to the one set in this property. This can be used for example to help conform to wolfCrypt FIPS 140-2/3 crypto usage by setting to "WKS" when wolfJCE is also used and installed on the system.
• Updates JSSE provider example ClientJSSE.java and ServerJSSE.java with new option to specify the KeyStore type (-ksformat)
• Add new option to example JSSE ClientJSSE.java to try and load system root/CA certs rather than using the provided KeyStore file (-sysca)
• Refactors WolfSSLKeyManager.java and WolfSSLTrustManager.java around attempting to find and load system root/CA certs, making it easier to maintain in the future and adding support for WKS type stores.
• Adds a script to convert example JKS files to wolfJCE WKS format (examples/provider/convert-to-wks.sh)
• Refactor X509Certificate.getPublicKey() to use JCE classes to generate PublicKey, fixes edge test case when wolfJCE is installed alongside wolfJSSE.

[JacobBarthelmeh]

Looks like this picked up a minor merge conflict. Please take a look at resolving it @cconlon

[cconlon]

@JacobBarthelmeh Thanks, merge conflicts should be resolved.