[optimization] Boot properties completions slow to show up

[BoykoAlex]

Initial invocation of content assists for completion proposals may be very slow (~2 sec) for the initial invocation or invocation after the classpath change.

The issue is completion text edit fetches java type data from JDT LS for all property value types. Instead it'd be good to push the computation of part of the edit to the completion item resolve stage. Alternative could be making value type fetching part of the spring properties indexing process (might be a better solution if we switch to YAML LS implementation for Spring Properties YAML)

[BoykoAlex]

Should be addressed with 1dfba38. Lazy edit computed during resolve stage is the solution in the commit: 1dfba38