Add new metadatav3 field `custody_subnet_count` to `GET node/identity` API

## Description

The `custody_subnet_count` field has been added to [`MetaDataV3`](https://github.com/sigp/lighthouse/blob/bcff4aa825c4d70a215e1f229a0d1798d697fb5b/beacon_node/lighthouse_network/src/rpc/methods.rs#L139), but we don't return it in the HTTP api yet and should be added: 

https://github.com/sigp/lighthouse/blob/ae8390150df7ab22bf2c08bf292641f54ca632c4/beacon_node/http_api/src/lib.rs#L2897-L2913

	metadata: api_types::MetaData {
	seq_number: *meta_data.seq_number(),
	attnets: format!(
	"0x{}",
	hex::encode(meta_data.attnets().clone().into_bytes()),
	),
	syncnets: format!(
	"0x{}",
	hex::encode(
	meta_data
	.syncnets()
	.cloned()
	.unwrap_or_default()
	.into_bytes()
	)
	),
	},

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Add new metadatav3 field `custody_subnet_count` to `GET node/identity` API #6348

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Add new metadatav3 field custody_subnet_count to GET node/identity API #6348

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Add new metadatav3 field `custody_subnet_count` to `GET node/identity` API #6348