feat: Include statistics for Reserved Fields #6009

Job	Run time
build (windows-latest)	6m 33s
Unit Tests (doc)	2m 25s
build_with_no_default_features (ubuntu-latest)	31s
build (ubuntu-latest)	3m 25s
build_with_no_default_features (macos-latest)	44s
check (ubuntu-latest)	6m 26s
build_with_no_default_features (windows-latest)	1m 40s
Unit Tests (default)	5m 0s
check (macos-latest)	9m 22s
Verify MSRV	3m 10s
build (macos-latest)	2m 57s
	42m 13s

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