Buy&Sell methods for Uniques (#11398)

* Allow to set item's price

* Clean the state when we transfer/burn an item or destroy a collection

* Allow to buy an item

* Remove redundant checks

* Improve events

* Cover with tests

* Add comments

* Apply suggestions

* Fmt

* Improvements for price validation

* Improve validation

* Update to use the new terminology

* Remove multi-assets support

* Chore

* Weights + benchmarking

* Shield against human error

* Test when we pass the higher item's price

* fmt fix

* Chore

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

* Remove is_frozen check when setting the price

* Try to fix benchmarking

* Fix benchmarking

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

* Add transactional

* Add 'allow deprecated' flag for transactional

* Remove #[allow(deprecated)]

* ".git/.scripts/bench-bot.sh" pallet dev pallet_uniques

Co-authored-by: Parity Bot <admin@parity.io>
Co-authored-by: command-bot <>