Update types

[sameh-farouk]

there was some tft bridge pallet changes on these recently merged PRs on tfchain that need to reflected in the graphql schema:

• https://github.com/threefoldtech/tfchain/pull/888

  • source account ID was added to BurnTransaction type and to BurnTransactionExpired events

• https://github.com/threefoldtech/tfchain/pull/885

  • tx_hash to the MintCompleted event

also a db migration should be included

[sameh-farouk]

checked the processor code and since the bridge events not handled/indexed so the changes is not applicable here and issue can be closed.