add origin data to Axelar assets

[JeremyParish69]

for assets bridged to Axelar from Ethereum and Moonbeam.

implements #420

now we can tell which tokens are bridged or synthetic, so dApps can properly deal with representing them. e.g., showing "USDC.axl" as the token symbol (the symbol Osmosis has chosen) instead of just "USDC" (which is the symbol Axelar has chosen). e.g., showing the USDC token logo with a little Axelar-marker (and perhaps an Ethereum logo as well?), distinguishing it from Gravity Bridge-bridged USDC from Ethereum, or from Axelar-bridged USDC from Polygon.

pending expansion of assetlist.schema.json

[JeremyParish69]

Implemented Dan's idea to move the specification of the Cosmos Chain Registry folder '_non-cosmos/' from the platform field to its own property which defaults to false. True means the platform is not a Cosmos chain