Add is_base_asset property to all transaction events in transaction funnel

[brad-decker]

Description

Product and business leaders would like to get a sense of how often MetaMask users send transactions of the base asset for the network. Essentially this means tracking any received Ether, BNB, etc but not ERC-20, ERC-721, etc. To do this we will need to modify the events in the TransactionController such that a new property is added to the event called is_base_asset

Requirements

1. Modify the buildEventFragmentProperties method in the TransactionController to use the method created in Create utility method for determining if a transaction is sending base asset for current network #13422 to determine if it is a simple send.
2. if the transaction is a simple send, set is_base_asset to true (default to false).