feature(#664): move test cert tool to fit connect cli

cli/pom.xml

...c/main/java/dev/fitko/fitconnect/cli/CommandExecutor.java

...main/java/dev/fitko/fitconnect/cli/CommandLineClient.java

...main/java/dev/fitko/fitconnect/cli/CommandLineRunner.java

.../fitko/fitconnect/cli/commands/CreateTestKeysCommand.java

...in/java/dev/fitko/fitconnect/cli/keygen/JWKGenerator.java

...rc/main/java/dev/fitko/fitconnect/cli/keygen/JWKPair.java

cli/src/main/resources/splash_screen_banner.txt

.../java/dev/fitko/fitconnect/cli/CommandLineClientTest.java

...ava/dev/fitko/fitconnect/cli/keygen/JWKGeneratorTest.java

pom.xml

tools/pom.xml

...rc/main/java/dev/fitko/fitconnect/sdk/tools/CertTool.java