feature: add vi-{a/inner}-{sexp/list} command.

[sakurawald]

To extends the text object in vi-mode. Like:

(define-key lem-vi-mode/binds::*inner-text-objects-keymap* "s" 'mark-sexp)
(define-key lem-vi-mode/binds::*outer-text-objects-keymap* "s" 'mark-sexp)

The mark-sexp didn't work well, its semantics is not the same as vi-a-sexp or vi-inner-sexp.
It's good to have extended text objects for vi-mode.

What i would like to configure is:

(define-key lem-vi-mode/binds::*inner-text-objects-keymap* "s" 'vi-inner-sexp)
(define-key lem-vi-mode/binds::*outer-text-objects-keymap* "s" 'vi-a-sexp)
(define-key lem-vi-mode/binds::*inner-text-objects-keymap* "l" 'vi-inner-list)
(define-key lem-vi-mode/binds::*outer-text-objects-keymap* "l" 'vi-a-list)

[sakurawald]

The list text-object is already impl as paren-text-object.
And the sexp text-object is almost the word text-object in lisp-mode. (The iskeyword vi option for lisp mode is modified to adept the lisp syntax).