Added similar text suggestion Code Action(s) for UndefinedObject and UndefinedNamespace

[AlexXuChen]

Added Qute Did you mean ...? CodeAction(s) for similar text suggestions for UndefinedNamespace, UndefinedObject.

Fixes #602

Signed-off-by: Alexander Chen alchen@redhat.com

[rgrunber]

Seems to be going in the right direction. Just some things to fix. I would really look at what the difference is between an expression, expressionpart and expressionparts as well as what their structure is like. That should help avoid any casting issues.

[Error - 10:53:06 a.m.] Request textDocument/codeAction failed.
  Message: Internal error.
  Code: -32603 
java.util.concurrent.CompletionException: java.lang.ClassCastException: class com.redhat.qute.parser.expression.Parts cannot be cast to class com.redhat.qute.parser.expression.Part (com.redhat.qute.parser.expression.Parts and com.redhat.qute.parser.expression.Part are in unnamed module of loader 'app')
	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture.postFire(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(Unknown Source)
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)
Caused by: java.lang.ClassCastException: class com.redhat.qute.parser.expression.Parts cannot be cast to class com.redhat.qute.parser.expression.Part (com.redhat.qute.parser.expression.Parts and com.redhat.qute.parser.expression.Part are in unnamed module of loader 'app')
	at com.redhat.qute.services.QuteCodeActions.doCodeActionsForSimilarValues(QuteCodeActions.java:368)
	at com.redhat.qute.services.QuteCodeActions.doCodeActions(QuteCodeActions.java:128)
	at com.redhat.qute.services.QuteLanguageService.doCodeActions(QuteLanguageService.java:99)
	at com.redhat.qute.ls.template.TemplateFileTextDocumentService.lambda$codeAction$9(TemplateFileTextDocumentService.java:158)
	at com.redhat.qute.ls.commons.ModelTextDocuments.lambda$computeModelAsyncCompose$2(ModelTextDocuments.java:145)
	... 10 more

[rgrunber]

Still a bit of work to support spelling errors for an object's properties/methods.

[angelozerr]

You need to update QuteDiagnosticsInExpressionWithForSectionTest.undefinedObjectInElseBlock:60 expected: <3> but was: <4> because your similar value report a code action with "items" as similar value for "item".

[angelozerr]

@AlexXuChen as it required so many changes, I decided to create a draft PR with my suggestions, see my draft PR based on your PR at #682

All tests should work. I have implemented namespace similar value without testing, please write tests like I suggested in #670 (comment)

[angelozerr]

Thanks a lot @AlexXuChen !