* add XChainCreateBridge integration test
* add XChainCreateClaimID integration test
* add XChainCommit integration test
* add XChainAccountCreateCommit integration test
* simplify tests
* add XChainModifyBridge integration test
* add XChainAddAccountCreateAttestation integration test
* add XChainAddClaimAttestation integration test
* improve SignerListSet integration test
* rename variable to match
* add XChainClaim integration test
* clean up
* add IOU attestation test
* fix integration tests issues
* minor refactors
* fix bug
* [WIP] switch to one bridge for all integration tests
* clean up
* fix tests
* fix + clean up tests