Contracts pallet: removal on idle (#11202)

* on_initialize -> on_idle

* use remaining_weight info

* no weight_limit for on_idle

* call on_idle in tests

* attempt to fix tests

* run on_initiaize when queue full

* add on_idle to weight info

* add on_idle weight info to on_idle hook

* add basic test for on_initialize with full queue

* disbale check for all keys gone in full queue, full block test

* queue_deth as usize, add comment

* comment was removed by accident

* Update frame/contracts/src/lib.rs

Co-authored-by: Alexander Theißen <[email protected]>

* cargo +nightly fmt

* update lazy_removal_does_no_run_on_full_queue_and_full_block

* remove changes in weights.rs

* weights on_idle -> on_process_deletion_queue_batch

* use block number for on_idle

* use BlockNumber for on_initialize

* 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_contracts --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/contracts/src/weights.rs --template=./.maintain/frame-weight-template.hbs

* Update frame/contracts/src/lib.rs

Co-authored-by: Alexander Theißen <[email protected]>

* remove outcommented code

* add check that queue still full for test

* cargo fmt

* cargo +nightly fmt

* Update frame/contracts/src/benchmarking/mod.rs

Co-authored-by: Alexander Gryaznov <[email protected]>

* fix weights.rs

* add lazy_removal_does_no_run_on_low_remaining_weight test

* Apply suggestions from code review

Co-authored-by: Alexander Gryaznov <[email protected]>

Co-authored-by: Alexander Theißen <[email protected]>
Co-authored-by: Parity Bot <[email protected]>
Co-authored-by: Alexander Gryaznov <[email protected]>