bug#69312: 30.0.50; [WISHLIST] dicitionary buffer should retain search information

[No Wayman]

Currently when searching with dictionary.el, the query is 
messaged.
e.g. in dictionary-do-search:

```emacs-lisp
(message "Searching for %s in %s" word dictionary)
```

It would be better to display this information in the resultant 
buffer somehow (inline, via the header-line, etc).
Especially for the case of `dictionary-match-words`, which matches 
against a PATTERN argument.
I'd like to not have to remember what my query was if I come back 
to that buffer at a later time.