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* Refactor event type decoding hand declartion Fixes #196, #181, #28 ## Dyanmic sized types Before this change, the event decoder assume all the event types have fixed sizes. Some counterexamples are: Hashes, AuthorityList. In this change, instead of decoding by skipping the fixed-length bytes, we introduce `type_segmenter` registry which decodes the raw event bytes with the actual scale codec. So variable length types can be handled correctly. ## New attribute for pallet type definition In the past, trait associated type is the only way to add types to the EventsDecoder implementation of a pallet. But in reality it's common that the events in a pallet references some types not defined in the trait associated types. Some examples are: `IdentificationTuple` and `SessionIndex` in Session pallet. In this change, we introduce more attributes to add the types: ```rust #[module] trait Pallet: System { #![event_type(SomeType)] #![event_alias(TypeNameAlias = SomeType)] #![event_alias(SomeOtherAlias = TypeWithAssociatedTypes<T>)] } ``` ## Tested Compile with `nightly-2020-10-01`; smoke test to sync a full Phala bockchain. * Format code * Make rustfmt::skip an outer attribute * Ignore the sample code * Alias the event segmenter closure * Copy AuthorityList from sp_finality_grandpa * Remove the unused static event type size * Make segmenter as a trait, resue grandpa::Public * Wrap PhantomData in struct TypeMarker