bug#49689: [FEATURE REQUEST] Explicitly report change of input method

[Boruch Baum]

Presently, a buffer's current input method is:

  1] Only reported in the form of a cryptic symbol on the mode line.

  2] Aforementioned cryptic symbol is not guaranteed to be unique
     (BUG?).

     (length input-method-alist)
     => 205

     (length (delete-duplicates
               (mapcar (lambda (x) (nth 3 x)) input-method-alist)))
     => 183

  2.1] Example: Hebrew and Hebrew-new

Please consider explicitly reporting changes to the input method. I've
done this to my personal satisfaction locally by adding a single line to
the end of each of functions `activate-input-method' and
`deactivate-input-method', both in file `mule-cmds'.

  (message "Current input method is now: %s" current-input-method))

This change has additional benefits:

  1] Letting me know what I've done when I mis-type `C-\'.

  2] Letting me know what to select when performing `C-h I'

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