Adds `stake-tracker` pallet and integrates with the staking pallet #5015

Job	Run time
check-dependency-rules	11s
set-image	10s
check-workspace	18s
check-markdown	15s
check-rust-feature-propagation	1m 54s
check-toml-format	55s
check-umbrella	2m 12s
fmt	1m 2s
test-rust-features	14m 48s
	21m 45s

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