Use new transient-define-group #620

Job	Run time
Compile / Get matrix	1m 27s
Compile / Compile using Emacs 29.4	58s
Compile / Compile using Emacs release-snapshot	52s
Compile / Compile using Emacs 29.1	37s
Compile / Compile using Emacs snapshot	41s
Compile / Compile using Emacs 30.1	1m 6s
Compile / Get matrix	1m 16s
Compile / Compile using Emacs 30.1	1m 46s
Compile / Compile using Emacs 29.4	1m 6s
Compile / Compile using Emacs snapshot	1m 0s
Compile / Compile using Emacs release-snapshot	1m 18s
Compile / Compile using Emacs 29.1	1m 0s
	13m 7s

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