fix: allow commas and semicolons between fields in constant messages #2064

Job	Run time
linux beta (default features)	2m 34s
linux stable (with-bytes)	1m 19s
linux stable (default features)	2m 43s
mega-linter	2m 15s
linux nightly (all features)	1m 55s
Miri test	41s
windows stable (default features)	5m 17s
Check sync-readme	43s
rustfmt check	44s
CI self-check	14s
	18m 25s

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