Update network id routing policy.

Updates the routing policy of a specified network ID.

Note: This API call is subject to Flexible Routing Schemes.

Your routing policy defines how your transactions are routed.
You can choose 1 of the 3 different schemes mentioned below for each asset type:

• None; Defines the profile routing to no destination for that asset type. Incoming transactions to asset types routed to None will fail.
• Custom; Route to an account that you choose. If you remove the account, incoming transactions will fail until you choose another one.
• Default; Use the routing specified by the network profile the connection is connected to. This scheme is also referred to as "Profile Routing"

Default Workspace Presets:

• Network Profile Crypto → Custom
• Network Profile FIAT → None
• Network Connection Crypto → Default
• Network Connection FIAT → Default

Supported asset groups for routing police can be found at /network_ids/routing_policy_asset_groups

- **Note**: By default, Custom routing scheme uses (`dstId` = `0`, `dstType` = `VAULT`).