Allow optional attributes in relation schemas about rom-http HOT 3 OPEN

@solnic / @flash-gordon, I wanted to check in on this. I'm running into a similar issue (where the APII am integrating with does not always return the full set of possible params on all requests to the same resource). dry-initializer and dry-schema support something similar to this already, I can work on a PR if this is still a possibility.

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@flash-gordon 👋🏻 just wanted to double-check with you - this makes perfect sense, right? We could follow the same convention as you introduced in dry-struct, so just adding attribute? and handle it as expected would do the trick. WDYT?

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As a somewhat philosophical point, since external API schemas are out of the control of the API wrapper library, it might make more sense if all attributes were assumed optional, or at least if there could be a ROM config to set this.

from rom-http.