Get Account Asset Count
Get the number of assets owned by an account given the account ID.
Request:
- requestType is getAccountAssetCount
 - account is the account ID
 - height is the height of the blockchain to determine the asset count (optional, default is last block)
 - requireBlock is the block ID of a block that must be present in the blockchain during execution (optional)
 - requireLastBlock is the block ID of a block that must be last in the blockchain during execution (optional)
 
Note: If table trimming is enabled (default), the height must be within 1440 blocks of the last block.
Response:
- numberOfAssets (N) is the number of assets owned by the account
 - lastBlock (S) is the last block ID on the blockchain (applies if requireBlock is provided but not requireLastBlock)
 - requestProcessingTime (N) is the API request processing time (in millisec)