Currently Data Availability API [is defined](https://github.com/lazyledger/optimint/blob/c9af93a6942a30f3c3d4d34c2eee32aee987598e/da/da.go) only for block submission. There is no common interface to query DA layer for data availability. Action Item: - [ ] write issue, code or ADR that defines this API