* Adds schema caching capabilities (off by default)
* Use InMemoryCacheAdapter
* Uses proper adapter to generate a cache
* Fix bugs when running disabled cache
* nits
* nits
* Use options object instead of boolean
* Imrpove concurrency of loadSchema
* Adds testing with SCHEMA_CACHE_ON
* Use CacheController instead of generator
- Makes caching SchemaCache use a generated prefix
- Makes clearing the SchemaCache clear only the cached schema keys
- Enable cache by default (ttl 5s)
