This is for code review right now. It adds selection of multiple expressions to extract-function.

TODO:

• rename extract-function-2 to something else OR replace existing
  extract-function? They behave almost exactly the same. The big issue is that
  this requires different parameters (two new ones - the beginning and end of
  the selection)

• change Calva to handle selection formats from clojure-lsp operations

• for code-actions/all is it better to change the tests to include
  nil end selection parameters or stick with the multivarity function?

• command/call-command also doesn't have an option to end selection,
  but I don't think
  it's possible to use a multivarity function. Is there a better way?

• documentation for emacs is wrong and I don't have a working lsp-mode
  to shoot a screenshot

• [ x] I created an issue to discuss the problem I am trying to solve or an open issue already exists.

• [ x] I added a new entry to CHANGELOG.md

• [ x] I updated documentation if applicable (docs folder)