feat: implement display trait for Ident #3090

Job	Run time
build (ubuntu-latest)	1m 33s
build_with_no_default_features (ubuntu-latest)	33s
build (macos-latest)	1m 27s
build_with_no_default_features (macos-latest)	35s
check (ubuntu-latest)	3m 30s
Verify MSRV	1m 54s
build (windows-latest)	7m 1s
build_with_no_default_features (windows-latest)	3m 54s
check (macos-latest)	3m 36s
unit	6m 30s
	30m 33s

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