pallet macro: Support instantiable pallets in tasks #4090

Job	Run time
preflight / preflight	38s
preflight / ci-versions	1m 18s
cargo-check-benches (master)	20m 13s
cargo-check-benches (current)	21m 47s
test-full-crypto-feature	2m 36s
cargo-check-each-crate (1)	21m 48s
test-frame-ui	46m 43s
cargo-check-each-crate (2)	20m 7s
test-node-metrics	10m 36s
cargo-check-all-crate-macos	10m 52s
cargo-check-each-crate (3)	7m 2s
cargo-check-each-crate (4)	19m 35s
cargo-check-each-crate (5)	29m 27s
cargo-check-each-crate (6)	15m 1s
cargo-check-each-crate (7)	31m 55s
test-frame-examples-compile-to-wasm	3m 0s
test-deterministic-wasm	7m 41s
check-tracing	2m 21s
check-metadata-hash	6m 57s
node-bench-regression-guard	13s
All test misc tests passed	1s
	4h 39m 51s

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