This function replaces both vim.treesitter.get_node_at_pos() and
vim.treesitter.get_node_at_cursor(). These two functions are similar
enough that they don't need separate interfaces. Even worse,
get_node_at_pos() returns a TSNode while get_node_at_cursor() returns a
string, so the two functions behave slightly differently.
vim.treesitter.get_node() combines these two into a more streamlined
interface. With no arguments, it returns the node under the cursor in
the current buffer. Optionally, it can accept a buffer number or a
position to get the node at a given position in a given buffer.
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