Ability to add custom IPFS gateways to URLParams

[kien-ngo]

@avneesh0612 @nachoiacovino We should be able to use the template with custom ipfs gateway as easy as this:

https://nft-template.com/?customIpfsGateways=http://pinata-gw.cloud/ipfs

Encouraging devs to roll their own gateways will benefit both parties since the end users do not have to share the same public gateway with million others and it'll put less stress on thirdweb's ipfs server