Add hooks to register event types for decoding (#227)

* Global registration of type segmenters for event decoding

* Perform type sizes check when building client

* Introduce EventTypeRegistry for global runtime type sizes

* Fmt

* Register runtime type sizes on creation of EventTypeRegistry

* Register more default dispatch types

* Add missing type sizes

* fmt

* Fix up register_type_size builder method

* Update doc comments

* Make register_default_type_sizes public

* Don't allow duplicate registered types

* Remove call to supertraits type registration, done manually in Runtime

* Fix tests and warnings

* Fix duplicate type registration

* Fmt

* review: use is_empty()

Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>

* Add panic docs

Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>

src/subscription.rs

@@ -34,9 +34,9 @@ use crate::{
 
 /// Event subscription simplifies filtering a storage change set stream for
 /// events of interest.
-pub struct EventSubscription<T: Runtime> {
+pub struct EventSubscription<'a, T: Runtime> {
     subscription: Subscription<StorageChangeSet<T::Hash>>,
-    decoder: EventsDecoder<T>,
+    decoder: &'a EventsDecoder<T>,
     block: Option<T::Hash>,
     extrinsic: Option<usize>,
     event: Option<(&'static str, &'static str)>,
@@ -44,11 +44,11 @@ pub struct EventSubscription<T: Runtime> {
     finished: bool,
 }
 
-impl<T: Runtime> EventSubscription<T> {
+impl<'a, T: Runtime> EventSubscription<'a, T> {
     /// Creates a new event subscription.
     pub fn new(
         subscription: Subscription<StorageChangeSet<T::Hash>>,
-        decoder: EventsDecoder<T>,
+        decoder: &'a EventsDecoder<T>,
     ) -> Self {
         Self {
             subscription,