feat: support provider query parameter

[vasco-santos]

Add support for provider query parameter

Description

This PR propagates provider from query parameters as described in https://github.com/vasco-santos/provider-hinted-uri/blob/main/EXPLORATION.md#-uri-design to be used as Hints by Helia's blockBrokers.

Regarding changes, it simply changes parseUrlString util function to verify if valid multiaddrs are in the query parameters and also returns them. They are then simply propagated to the options parameter that makes its way to the plugins pipeline, where a broker session is created and is used.

These feature is currently behind a feature flag while it is in experimental stage (allowProviderParameter)

const url = `ipfs://${cid}?${query}`
const resp = await verifiedFetch.fetch(url, {
  allowProviderParameter: true
})

Notes & open questions

Currently does not embed proto in the multiaddrs (for instance /retrieval/bitswap/retrieval/http). We will as follow up discuss how to support something along these lines.

@achingbrain while this is more experimental, opted to not add example in Readme. Should I add though?

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works

[vasco-santos]

eslint complains there is too many nested callbacks 😬

[lidel]

Triage note:

• @vasco-santos is this still something you want to pursue, or ok to park as draft for now?

[achingbrain]

Superseded by #318