added a new DynamicFinder (which can be used with rust_analyzer) (#705)

* started tree finder

* made tree more ergonmic

* deleted unneeded comments

* added stack root and node

* added preprocessing

* using staticfinder instead of separate finder, custom entry maker

* added selections and remember

* removed unused stuff

* fixed warnings

* fixed remember and selections pop

* started branch

* added go function

* changed up test

* removed root parameter from go function

* changed back to not do_close

* removed node and leaf classes

* removed stack class instead for table.insert and table.remove

* fixed warning

* started branch

* added better preprocessor and tree class

* started some tests

* finished making tests pass

* cleaned up

* fixed make entry and updated example

* started

* added some stuff

* deleted uneeded stuff

* added cancelable

* changed workspace requester

* use better cancellation mechanism

* removed accidental stuff

* removed useless print

* delete more useless stuff

* rename to dynamic

* added request cancellation

* CHECK IF NIL

* removed unused

* added trash global variable

.luacheckrc

@@ -13,6 +13,7 @@ ignore = {
 }
 
 globals = {
+  "_",
   "TelescopeGlobalState",
   "TelescopeCachedUppers",
   "TelescopeCachedTails",