Fix eshell-mode-map initialization

Fix eshell-mode-map initialization

* lisp/eshell/esh-mode.el (eshell-mode-map, eshell-command-map): Set
up normal keymaps and prefix commands rather than re-initializing them
in each eshell buffer

* lisp/eshell/em-cmpl.el (eshell-cmpl-mode-map, eshell-cmpl-mode)
(eshell-cmpl-initialize):
* lisp/eshell/em-hist.el (eshell-hist-mode-map, eshell-hist-mode)
(eshell-hist-initialize):
* lisp/eshell/em-pred.el (eshell-pred-mode-map, eshell-pred-mode)
(eshell-pred-initialize):
* lisp/eshell/em-prompt.el (eshell-prompt-mode-map, eshell-prompt-mode)
(eshell-prompt-initialize):
* lisp/eshell/em-rebind.el (eshell-rebind-mode-map, eshell-rebind-mode)
(eshell-rebind-initialize):
* lisp/eshell/esh-arg.el (eshell-arg-mode-map, eshell-arg-mode)
(eshell-arg-initialize):
* lisp/eshell/esh-proc.el (eshell-proc-mode-map, eshell-proc-mode)
(eshell-proc-initialize):
* lisp/eshell/esh-var.el (eshell-var-mode-map, eshell-var-mode)
(eshell-var-initialize): Create a new minor mode with a keymap and
call it in the module initialization function.

bug#33808
bug#22792