Decouple Providing from PutBlock

[evan-forbes]

Summary

Move providing outside of the PutBlock function and into its own.

Details

Only the data availability header and access to the context routing IPFS api is needed in order to provide to the IPFS DHT, so it is possible to decouple providing from the PutBlock. This gives us the advantage of having more control over when we provide and when we do not. This has already been done in the PR that inspired this issue, celestiaorg/celestia-core#427, but should likely be decoupled from that PR into its own.

Action Items

• create a new Provide function
• remove providing from PutBlock

References

• this would make Save and load block data using IPFS celestia-core#374 cleaner, as no providing should be performed when saving and loading block data to the local IPFS store.
• natural continuation of ipld: Manual providing  celestia-core#375
• would eventually help with ADR: Block Propagation During Consensus  celestia-core#423
• Already implemented in Preliminary introduction of RowSet with supporting changes celestia-core#427

[liamsi]

Falls outside of this repo. How and if the IPFS DHT will be used should be part of the discussion in #1