Add missing getInstance(String, Provider) method to SSLContextFactory

[Copilot]

SSLContextFactory was incomplete—it exposed getInstance(String) and getInstance(String, String) from SSLContext but not getInstance(String, Provider).

Changes

• SSLContextFactory interface: Added getInstance(String protocol, Provider provider) method signature matching SSLContext API
• ECFSSLContextFactory implementation: Delegates to SSLContext.getInstance(protocol, provider) with null handling consistent with the underlying API
• SSLContextFactoryTest: Added test case for the new method
• Javadoc: Fixed incorrect link for getInstance(String, String) method

Usage

Provider provider = SSLContext.getDefault().getProvider();
SSLContext context = sslContextFactory.getInstance("TLS", provider);

Fixes eclipse-ecf#233

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• bndtools.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.11/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.11/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.11 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.11/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/ecf/ecf org.codehaus.plexus.classworlds.launcher.Launcher clean install -DskipTests (dns block)
• repo.eclipse.org
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --enable-native-access=ALL-UNNAMED -classpath /usr/share/apache-maven-3.9.11/boot/plexus-classworlds-2.9.0.jar -Dclassworlds.conf=/usr/share/apache-maven-3.9.11/bin/m2.conf -Dmaven.home=/usr/share/apache-maven-3.9.11 -Dlibrary.jansi.path=/usr/share/apache-maven-3.9.11/lib/jansi-native -Dmaven.multiModuleProjectDirectory=/home/REDACTED/work/ecf/ecf org.codehaus.plexus.classworlds.launcher.Launcher clean install -DskipTests (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Fix eclipse-ecf#233

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