light: CHT and bloom trie indexers working in light mode (#16534)

This PR enables the indexers to work in light client mode by
downloading a part of these tries (the Merkle proofs of the last
values of the last known section) in order to be able to add new
values and recalculate subsequent hashes. It also adds CHT data to
NodeInfo.

eth/backend.go

@@ -130,7 +130,7 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 		gasPrice:       config.GasPrice,
 		etherbase:      config.Etherbase,
 		bloomRequests:  make(chan chan *bloombits.Retrieval),
-		bloomIndexer:   NewBloomIndexer(chainDb, params.BloomBitsBlocks),
+		bloomIndexer:   NewBloomIndexer(chainDb, params.BloomBitsBlocks, bloomConfirms),
 	}
 
 	log.Info("Initialising Ethereum protocol", "versions", ProtocolVersions, "network", config.NetworkId)