Add integration tests for testing on live testnets

[soareschen]

We will add basic integration tests that connect to live testnets for Starknet and Osmosis. Hopefully, the only change needed is to change the field values in the chain context.

The main complication with the test is that we will need to create shared wallets with sufficient tokens to cover the gas fees. The wallet keys may be stored as GitHub secrets for running on the CI.