Add new EdgeTxInfo types

[Jon-edge]

CHANGELOG

• added: EdgeTxInfo types to tag known transaction types (swap, stake, etc)

Dependencies

none

Description

none

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[Jon-edge]

I question the need for this. In our exchange plugins this denotes which side is
the guaranteed amount - the payment or receive amount. In this API, we already
define a nativeAmount for both sides in EdgeTxAsset. We can just make
nativeAmount optional to denote an unknown swap destAsset amount for some order
with slippage. Fills will then have both src/dest with nativeAmount populated.

[swansontec]

Approving this part, but we need to do more inner plumbing to get the data sent to the right place.