Update content retrieval methods

[gravenp]

Based on discussions around Geo-Web-Project/cadastre#460, there are two ways that we can improve media retrieval on the Spatial Browser:

• Don't assume content is linked only with IPFS (i.e. parse URI for ipfs & http links)
• Implement fallback for the IPFS gateway used in the event one is blocked or unavailable (list of gateways here: https://ipfs.github.io/public-gateway-checker/)

[gravenp]

With Geo-Web-Project/cadastre#511 & Geo-Web-Project/cadastre#512, we moved the Cadastre to using @helia/verified-fetch. Verified Fetch included IPFS gateway fallback functionality, so we should utilize that on the browser as well.

@tnrdd