Ignore undocumented protocol messages

[apupier]

Issue informations

in Eclipse Theia, several traces are set such as:

Apr 10, 2019 11:58:55 AM org.eclipse.lsp4j.jsonrpc.services.GenericEndpoint notify
INFO: Unsupported notification method: $/setTraceNotification

it seems that the language server needs to (either implement) or specify to ignore undocumented protocol messages.
See eclipse-theia/theia#4855 (comment) and microsoft/vscode-languageserver-node#170

[apupier]

I have a branch with a potential fix but I cannot test it for now https://github.com/apupier/camel-language-server-1/tree/226-ignoreUndocumentedProtocolMessages
asked for help on eclipse-theia/theia#4855 (comment)