Investigate encoding of adapter instructions

[bruce-riley]

Currently, the adapter instructions passed into sendMessage and quoteDeliveryPrice are encoded into bytes, which requires decoding back into an array. This follows the model used in NTT. It's possible that it would be more efficient to just pass in an array. Should do some testing to see if that is the case.

Forge testing indicates that for two or less adapters, passing in the array is faster, but for three or more, the encoded bytes is faster. It is possible that passing in the array from the front end may require transferring considerably more data, which may be more expensive.

A more detailed analysis is required, probably with anvil testing.