ADD:POOL Transaction Type

We need a transaction that adds assets to pools with no expectation of return.

This will allow incentives, BNB-filling for Gas and more.

The transaction type is:

ADD:SYMBOL-XXX

This simply add assets to the pool, and can be a multi-send. Anyone can do this.

Adding 1 BNB to the BNB pool to pay for Gas:

ADD:BNB w/ 1:BNB

Adding 1 RUNE and 1 BOLT to the BOLT pool to incentivise stakers:

ADD:BOLT-123 w/ 1:RUNE, 1:BOLT

Since the balances have increased, stakers now own pro-rata more and have earnt a small non-fee return.