Add BoundedVec to Treasury Pallet (#8665)

* bounded treasury approvals

* update benchmarks

* update configs

* cargo run --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_treasury --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/treasury/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* fix weight param

Co-authored-by: Parity Benchmarking Bot <[email protected]>