Change file monitoring for LCLS

[evie-lau]

To support custom config files, after OpenLiberty/liberty-language-server#212 goes in, the IDE client side needs to be changed to monitor the following to send to LCLS:

• all .env and .properties files - language support
• liberty-plugin-config.xml - watch file for changes
  • since IJ doesn't currently have built-in LSP support, may have to add our own Listener or File Watcher implementation and link it to the LibertyWorkspaceService

liberty-tools-intellij/src/main/resources/META-INF/lsp.xml

Lines 39 to 40 in b66def7

	<languageMapping language="Properties" serverId="libertyls"
	filePattern="**/{src/main/liberty/config,usr/servers/**}/{bootstrap.properties,server.env}"/>

Whether or not this change is implemented shouldn't break anything, but will not have support for custom config files.

Can model after OpenLiberty/liberty-tools-vscode#286