* Add some important events to batch & staking to ensure ease of analysis

* Update frame/staking/src/pallet/mod.rs

Co-authored-by: Zeke Mostov <[email protected]>

* Update lib.rs

* fix test

Co-authored-by: Zeke Mostov <[email protected]>
Co-authored-by: Shawn Tabrizi <[email protected]>