feat: allow pressing apply_all mapping anywhere in sidebar (#528) (#712)

- make apply and apply_all mappings configurable
- fixed bug where apply mapping was not unbound in unbind_apply_key
- allow apply_all mapping to be pressed anywhere in the sidebar

fixes #528

lua/avante/config.lua

@@ -151,6 +151,8 @@ Respect and use existing conventions, libraries, etc that are already present in
       suggestion = "<leader>as",
     },
     sidebar = {
+      apply_all = "A",
+      apply_cursor = "a",
       switch_windows = "<Tab>",
       reverse_switch_windows = "<S-Tab>",
     },