add konveyor.loadSolution command used by existing command konveyor.loadStaticResults
store loaded analysis results and received solution inside ".vscode/konveyor" folder
a) last 5 files are stored for each type
b) file name is unique - with human readable sufix (datetime)
change ECMA level to "ES2021" for libs to get String.replaceAll()
introduce Change interface with props:
a) "original" - relative file path before the change, may be empty if file was created in this change
b) "modified" - relative file path after the change, may be empty if file was deleted in this change
c) "diff" - diff in unified format - tested with git diffs
Changes: