Validate resource logo URL is an URL starting with http or https

[mike-podolskiy90]

Issues were discovered in this IPT https://ipt.jbrj.gov.br/jabot

IPT accepts images to be embed like data:[<mediatype>][;base64],<data> which is not accepted by the registry. Registry expects logos to be proper URLs starting with http or https and it prevents resources from registration.

https://github.com/gbif/gbif-api/blob/dev/src/main/java/org/gbif/api/util/URIValidator.java#L55

So we have to align the IPT with the registry and require the same.