Improve computation of Quarkus/Microprofile properties

[angelozerr]

Improve computation of Quarkus/Microprofile properties

Fixes #154

Signed-off-by: azerr azerr@redhat.com

[angelozerr]

This PR is a big refactorinh which includes :

• rename of Quarkus to MicroProfile (projects, classes, packages)
• provide the propertiesProvider Eclipse extension point to compute the Quarkus properties. There is an implementation of propertiesProvider per annotation (MicroProfile @ConfigProperty, Quarkus @configroot, @ConfigProperties annotations)
• the ExtendedConfigDescriptionBuildItem was renamed to ItemMetadata (Spring Boot name) and the structure follows the same than Spring Configuration metadata. See https://docs.spring.io/spring-boot/docs/current/reference/html/appendix-configuration-metadata.html

For the moment property value (completion, hover, validation for value) is not implemented (regression). I will work on this issue.

Tests (except test with values) should work.

This PR requires the vscode quarkus PR redhat-developer/vscode-quarkus#171

[xorye]

After hovering a property in application.properties, I got this in the server trace:

[Trace - 11:48:32 a.m.] Sending request 'textDocument/hover - (8)'.
Dec 09, 2019 11:48:32 AM org.eclipse.lsp4j.jsonrpc.RemoteEndpoint fallbackResponseError
SEVERE: Internal error: java.lang.ClassCastException: com.redhat.microprofile.model.Assign cannot be cast to com.redhat.microprofile.model.PropertyValue
java.util.concurrent.CompletionException: java.lang.ClassCastException: com.redhat.microprofile.model.Assign cannot be cast to com.redhat.microprofile.model.PropertyValue
	at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273)
	at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280)
	at java.util.concurrent.CompletableFuture.biApply(CompletableFuture.java:1121)
	at java.util.concurrent.CompletableFuture$BiApply.tryFire(CompletableFuture.java:1084)
	at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:457)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

It only happened once and I'm having a very hard time reproducing this error.