Add ability to create custom textobjects by providing a query

[meain]

;; The first arguemnt to `evil-textobj-tree-sitter-get-textobj' will be the capture group to use
;; and the second arg will be an alist mapping major-mode to the corresponding query to use.
(define-key evil-outer-text-objects-map "m" (evil-textobj-tree-sitter-get-textobj "import"
                                              '((python-mode . [(import_statement) @import])
                                                (rust-mode . [(use_declaration) @import]))))