EvalCache quering #628
Description
Flag DB could become really big during its lifetime (deprecated flags, disabled flags, test flags, etc.), so it would be nice to have an option to query EvalCache for particular flags (like FindFlags operation does, but without actual SQL request execution). For example, we actively use export API to get a current flags' state in our system, but it became huge over time, so it scales very bad (network, client's post-filtration). What are your thoughts on extending export API with FindFlags-like filtration options (e.g. enabled, tags, key, preload)?