* Bug fix: unescape backslashes in regexes
Root problem is that there are too many backslashes in the SRA spec
itself. See https://github.com/0xProject/0x-monorepo/issues/1727
This was previously fixed for heavily-tested endpoints (get and post
order, etc), but was only recently discovered for the get-order-config
endpoint.
* Demonstrate get_order_config()
* Rename DefaultApi to RelayerApi
* Simplify RelayerApi instantiation
* Document paylod and response schemas
* Stop caring which contracts are wrapped
* Increase platform agnosticism
* Update CHANGELOG
* Remove unnecessary f-string
551a65c069