Refactor activate() to use await

Closes redhat-developer#2906

Signed-off-by: David Thompson <davthomp@redhat.com>

Author: datho7561

src/commands.ts

@@ -283,7 +283,7 @@ export namespace Commands {
 
     export const NOT_COVERED_EXECUTION = '_java.notCoveredExecution';
 
-    export const MEATDATA_FILES_GENERATION = '_java.metadataFilesGeneration';
+    export const METADATA_FILES_GENERATION = '_java.metadataFilesGeneration';
 
     export const RUNTIME_VALIDATION_OPEN = 'java.runtimeValidation.open';