Add match-data to isearch state and repeat faces to highlight group matches

Add match-data to isearch state and repeat faces to highlight group matches

* lisp/isearch.el (isearch-match-data): New variable.
(isearch-mode): Set isearch-match-data to nil.
(isearch-update): Call isearch-highlight with isearch-match-data.
(isearch--state): Add isearch-match-data.
(isearch--set-state): Restore isearch-match-data.
(with-isearch-suspended): Preserve isearch-match-data.
(isearch-search): Set isearch-match-data to integers.
(isearch-group-1): Rename from isearch-group-odd and adjust colors.
(isearch-group-2): Rename from isearch-group-even and adjust colors.
(isearch-highlight): Add optional arg 'match-data'.
Rewrite search-highlight-submatches part to recycle faces.

* doc/emacs/search.texi (Search Customizations): Amend the
documentation for isearch-group faces.

(bug#6227, bug#43702)