feat: disallow re-using token names and symbols within a pool #1087

Job	Run time
Get HEAD commit message	4s
Check formatting	1m 35s
Run Clippy checks (--all-targets --all-features)	15m 28s
Run Chopsticks tests	1h 46m 55s
Check cargo-deny rules	1m 30s
Run Clippy checks (--all-targets)	15m 3s
Run Clippy checks (--target wasm32-unknown-unknown --no-default-features --workspace --exclude ki...	6m 51s
Check Rustdoc	15m 3s
Run Cargo tests	1h 6m 21s
Check Rustdoc (--all-features)	15m 39s
Run try-runtime (peregrine)	17m 6s
Run Cargo tests (--all-features)	1h 2m 9s
Test runtime benchmarks	0s
Run try-runtime (spiritnet)	21m 42s
Trigger GitLab CI	0s
	5h 45m 26s

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