fix: improve exception handling in InlayHintProvider

[joaodinissf]

If the request for an inlayHint() ends exceptionally, always return an empty list.

In addition, if the exception is due to a cancellation request, skip the logging of the error. This is analogous to

lsp4e/org.eclipse.lsp4e/src/org/eclipse/lsp4e/outline/LSSymbolsContentProvider.java

Lines 429 to 436 in 2f4198a

	symbols.exceptionally(ex -> {
	if (!(ex instanceof CancellationException || CancellationUtil.isRequestCancelledException(ex))) {
	lastError = ex;
	LanguageServerPlugin.logError(ex);
	}
	viewer.getControl().getDisplay().asyncExec(viewer::refresh);
	return Collections.emptyList();
	});

[rubenporras]

thanks