Add coordinator rotation test (#535)

* add node side unit test

* complete rotation test for all networks

* set up the fast-epoch docker file

* fix pr comments

* add coordinator side rotation test

* bug fixes

* Remove EPOCH_INTERVAL

* Minor nits

* Add note on origin of publish_tx function in tests/coordinator

* Correct ThresholdParams assert_eq

* fmt

* Correct detection of handover completion

* Restore key gen message match from develop

It was modified in response to the handover completion bug, which has now been
resolved.

* bug fixes

* Correct invalid constant

* Typo fixes

* remove selecting participant to remove at random

---------

Co-authored-by: Luke Parker <lukeparker5132@gmail.com>

substrate/abi/src/grandpa.rs

@@ -1,4 +1,3 @@
-use sp_core::{ConstU32, bounded::BoundedVec};
 use sp_consensus_grandpa::EquivocationProof;
 
 use serai_primitives::{BlockNumber, SeraiAddress};
@@ -19,7 +18,7 @@ pub enum Call {
 #[cfg_attr(feature = "serde", derive(serde::Serialize))]
 #[cfg_attr(all(feature = "std", feature = "serde"), derive(serde::Deserialize))]
 pub enum Event {
-  NewAuthorities { authority_set: BoundedVec<(SeraiAddress, u64), ConstU32<0>> },
+  NewAuthorities { authority_set: alloc::vec::Vec<(SeraiAddress, u64)> },
   // TODO: Remove these
   Paused,
   Resumed,