Update animal-sniffer plugin to java18

[krismcqueen]

The baseline for the Gateway is going to be Java 1.8, and so the animal-sniffer plugin that validates the API calls made by Gateway code needs to be updated to use 1.8. The following steps are required:

• release a java18 signature to maven central under the org.kaazing group id (the signature can be built with https://github.com/ianbrandt/animal-sniffer-signatures)
• update the community pom to pull in the java18 signature from the org.kaazing groupId
• update the community pom to use animal-sniffer 1.14
• update the community pom to allow animal-sniffer to be skipped if required (default should be not skipped)

[krismcqueen]

Under review: #25