feat: Allow overriding actions from mappings (#248)

lua/telescope/state.lua

@@ -1,12 +1,21 @@
 local state = {}
 
 TelescopeGlobalState = TelescopeGlobalState or {}
+TelescopeGlobalState.global = TelescopeGlobalState.global or {}
 
 --- Set the status for a particular prompt bufnr
 function state.set_status(prompt_bufnr, status)
   TelescopeGlobalState[prompt_bufnr] = status
 end
 
+function state.set_global_key(key, value)
+  TelescopeGlobalState.global[key] = value
+end
+
+function state.get_global_key(key)
+  return TelescopeGlobalState.global[key]
+end
+
 function state.get_status(prompt_bufnr)
   return TelescopeGlobalState[prompt_bufnr] or {}
 end