eth/tracers: implement debug.intermediateRoots (#23594)

This PR implements a new debug method, which I've talked briefly about to some other client developers. It allows the caller to obtain the intermediate state roots for a block (which might be either a canon block or a 'bad' block).

internal/web3ext/web3ext.go

@@ -391,6 +391,12 @@ web3._extend({
 			params: 2,
 			inputFormatter: [null, null]
 		}),
+		new web3._extend.Method({
+			name: 'intermediateRoots',
+			call: 'debug_intermediateRoots',
+			params: 2,
+			inputFormatter: [null, null]
+		}),
 		new web3._extend.Method({
 			name: 'standardTraceBlockToFile',
 			call: 'debug_standardTraceBlockToFile',