Improve codelens refresh

[sideninja]

Codeless are currently refreshed by adding and removing a space in a file as seen here

vscode-cadence/extension/src/utils/codelens.ts

Line 8 in c2bc971

export const refreshCodeLenses = (): void => {

This is not a great implementation and it would be better to research how to trigger an update by calling the LS client directly. The cons of current implementations are:

• the codelenss are requested twice (one for adding space one for removing) which creates extra load
• whenever you just open a project file and then close it, it always asks you whether you want to save which is really confusing because you didn't create a change
• is just very fragile imho