Abstract & Update logic in Batcher::add_transaction_to_account()

[andrewvious]

Closes #222
Abstracts bridge logic from apply_send_transaction(), and add's two new fns to handle the logic previously stored in add_transaction_to_account().

• First handles token updates for BridgeIn event
• Second handles token updates for accounts involved in Send event

Removes redundant logic for ETH_ADDR & VERSE_ADDR since the two are in persistence, and the logic is never reached.
If we want specific logging for these, I can rewrite the logic to match for them rather than having them in if else statements. Otherwise I don't see the need for it.

[eureka-cpu]

@andrewvious was this waiting on something?

[andrewvious]

@andrewvious was this waiting on something?

I'd like to test it in either DO box or lasr vm before merging, awaiting approval as well @eureka-cpu