feat: disallow re-using token names and symbols within a pool #1080

Job	Run time
Get HEAD commit message	3s
Check cargo-deny rules	1m 21s
Check formatting	1m 28s
Run Chopsticks tests	1h 8m 41s
Run Clippy checks (--all-targets --all-features)	15m 29s
Run Clippy checks (--all-targets)	15m 23s
Run Clippy checks (--target wasm32-unknown-unknown --no-default-features --workspace --exclude ki...	7m 22s
Run try-runtime (peregrine)	17m 34s
Check Rustdoc	15m 11s
Run Cargo tests	53m 7s
Run try-runtime (spiritnet)	22m 11s
Check Rustdoc (--all-features)	15m 36s
Test runtime benchmarks	0s
Run Cargo tests (--all-features)	44m 27s
Trigger GitLab CI	1s
	4h 37m 54s

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