Support retrievals from multiaddrs with http-path segment

[bajtos]

Support the recently added multiaddr protocol http-path, so that Spark checkers can retrieve data from providers serving retrievals at non-root base URL.

Example value we need to support:

/dns/f03303347-market.duckdns.org/https/http-path/%2Fipni-provider%2F12D3KooWJ91c6xQshrNe7QAXPFAaeRrHWq2UrgXGPf8UmMZMwyZ5

• Enhance multiaddrToHttpUrl() in Spark checker to handle http-path segments
• If spark-spot-check is using Lassie for HTTP retrievals, then we need to upgrade Zinnia to use the latest Lassie version. The current Lassie version in Zinnia does not support http-path. We are discussing Lassie upgrade in Segfaults When Running Zinnia Installed via Cargo zinnia#655

Loosely related:

• Spark DDO support for Curio #231

[bajtos]

I discussed this topic with the Curio team. The are serving retrievals at the root path (not using http-path multiaddr), therefore we don't need to implement the change described above in order to support Curio.

See also:

• fix: ipni ad addr value filecoin-project/curio#415