rpc: unify all ledger sequence types to uint32 and stop stringyfying … #2970

Job	Run time
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	2m 22s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	2m 45s
Build (macos-latest, x86_64-apple-darwin, amd64)	7m 52s
Build (macos-latest, aarch64-apple-darwin, arm64)	3m 36s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	7m 22s
Unit tests (ubuntu-20.04, 1.21)	6m 33s
Integration tests (ubuntu-20.04, 1.21, .CLI.)	18m 50s
Integration tests (ubuntu-20.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	15m 39s
	1h 4m 59s

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