[FR] Add a way to append vendor specific properties to resource

[werman]

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I'm looking into implementing RMV support in Mesa for Turnip driver (open-source VK driver for Adreno GPUs). (In fact, I already made a prototype which works)

However, resources beside vendor agnostic properties - have a few radeon-specific ones, e.g.: RmtResourceDescriptionPipeline::is_ngg, RmtResourceDescriptionImage::tiling_type, and so on.

On the other hand we'd want to have our own properties specific to our GPU - It would be great if there could be a way to dynamically add properties.