Motion around node

It would be very convenient to have in addition to init_selection a similar command that works in operator-pending mode, i.e., something like "around node" or "an", so that one can use "dan", "yan" etc.

Currently the same functionality can be done by first invoking the init_selection and then using the operator, but in my opinion around operator can be useful as well. There is also a treesitter-textobjects, that allows around motions, but only for selected tags in selected languages, whereas "around node" should be quite general.

I have tried to use the public api of treesitter to write this functionality, but failed, perhaps due to my lack of knowledge. If there is a way, maybe it can be added to the documentation, and if not I believe that this can easily be done using the inner workings of nvim-treesitter.

Start by reading the existing init_selection behavior and the public Tree-sitter API, then compare it with the inner workings of nvim-treesitter-textobjects. Determine how an around-node motion should work in operator-pending mode and verify that commands such as dan and yan provide the requested behavior.