feat: helia supports additional byteProviders

[SgtPooki]

Work for addressing issues in #274.

The direction I'm thinking with this is:

• We have ByteProvider and BlockProviders
• Users are given a helper function to create trustless-http-gateway byte-providers
• Users provide byteProviders array in helia instantiation (which will be used to construct BlockProviders that are passed a blockstore, and cannot be edited)
• NetworkedStorage, which is what calls bitswap, was slightly refactored to call both bitswap & any given blockProviders, wrapping and listening to the given signal so that we can cancel any outstanding requests and prevent additional requests if any byteProvider returns quickly enough
• Users have no control over BlockProvider instances (because a blockstore is required), but shouldn't need to (correct me if i'm wrong)

---

This is still a WIP, but confirmed it's working locally with:

import { createHelia } from 'helia'
import { CID } from 'multiformats/cid'

const node = await createHelia()

const blocks = await node.blockstore.get(CID.parse('QmSnuWmxptJZdLJpKRarxBMS2Ju2oANVrgbr2xWbie9b2D'), {signal: AbortSignal.timeout(10000)})
console.log('done')

Output:

  helia:gateway-block-provider getting block for QmSnuWmxptJZdLJpKRarxBMS2Ju2oANVrgbr2xWbie9b2D from https://dweb.link +0ms
  helia:gateway-block-provider getting block for QmSnuWmxptJZdLJpKRarxBMS2Ju2oANVrgbr2xWbie9b2D from https://cf-ipfs.com +2ms
  helia:gateway-block-provider getting block for QmSnuWmxptJZdLJpKRarxBMS2Ju2oANVrgbr2xWbie9b2D from https://4everland.io +0ms
  helia:gateway-block-provider getting block for QmSnuWmxptJZdLJpKRarxBMS2Ju2oANVrgbr2xWbie9b2D from https://w3s.link +1ms
  helia:gateway-block-provider getting block for QmSnuWmxptJZdLJpKRarxBMS2Ju2oANVrgbr2xWbie9b2D from https://cloudflare-ipfs.com +1ms
  helia:gateway-block-provider got block for QmSnuWmxptJZdLJpKRarxBMS2Ju2oANVrgbr2xWbie9b2D from https://dweb.link +229ms

---

[SgtPooki]

we could wrap the blockstore on put that re-hashes it to verify.

we don't need to parse the data.. we just need to verify that when we hash the block with the cid.multihash.code is the same.

add method to this class for verifying bytes. might be able to use util methods in blockstore classes/package

[achingbrain]

This is great! I've taken some of the ideas here and opened #280 which I think is a bit simpler. Let me know what you think.

[SgtPooki]

superseded by #280