BA-XXX: add BackedWrappedOracleForwarder and BackedWrappedOracleForwarderFactory contract

[0xChristof]

No description provided.

[leviadam]

Thanks @0xChristof.

A few comments:

1. I think that we can maybe assume that the decimals are the same in both origin and wrapper (but we can also keep this generic version)
2. This implementation is very straight forward, which is good. We might want to think about someone changing the price via contribution to the wrapper. We should be carful about this.
3. We must have tests

[0xChristof]

Thanks @0xChristof.

A few comments:

1. I think that we can maybe assume that the decimals are the same in both origin and wrapper (but we can also keep this generic version)
2. This implementation is very straight forward, which is good. We might want to think about someone changing the price via contribution to the wrapper. We should be carful about this.
3. We must have tests

@leviadam Thanks for your comments! This is just a draft PR that I’m still working on (I’ve marked it with the WIP tag) - so some things like tests, deployment, etc., are still missing. Of course, I’ll take all your comments into account and let you know once this PR is ready for review! 🙂