## Description 

Add additional block types for I/O and data manipulations.
Add skeleton for DagState and Store. I will add more details to them
before the PR is merged.

## Test Plan 

CI

---
If your changes are not user-facing and do not break anything, you can
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### Type of Change (Check all that apply)

- [ ] protocol change
- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes