Only send COMPLETION_EXECUTION_TIME once per completion request

[fbricon]

Currently COMPLETION_EXECUTION_TIME is duplicated in the data section of each completion item returned by the completion request. It could be sent only once at the root of the response, to reduce the payload size

[rgrunber]

Looking at CompletionList, it does appear to have itemDefaults.data : LSPAny, so we should be able to add it there, since we do have itemDefaults support.

[jdneo]

Looking at CompletionList, it does appear to have itemDefaults.data : LSPAny, so we should be able to add it there, since we do have itemDefaults support.

I tried that but not succeed. If the completion item has data set, then it just simply replaces the data in itemDefaults (not merging). in each completion item, there are unique pid & rid, so we cannot put common data into itemDefaults.