Pallet Assets: Create new asset classes from genesis config (#9742)

* Pallet Assets: Allow creating asset classes from genesis config

* Add accounts and metadata to genesis config

* whitespace fixes

* Update more chainspecs

* Run rustfmt over code

* More formatting fixes

* Update frame/assets/src/lib.rs

Improve error message

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update frame/assets/src/lib.rs

Improve error message

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/bin/node/testing/src/genesis.rs

@@ -98,6 +98,7 @@ pub fn config_endowed(
 		treasury: Default::default(),
 		society: SocietyConfig { members: vec![alice(), bob()], pot: 0, max_members: 999 },
 		vesting: Default::default(),
+		assets: Default::default(),
 		gilt: Default::default(),
 		transaction_storage: Default::default(),
 	}