Gilts Pallet (#8139)

* Initial draft

* Enlarge function drafted.

* Thaw draft

* Retract_bid draft

* Final bits of draft impl.

* Test mockup

* Tests

* Docs

* Add benchmark scaffold

* Integrate weights

* All benchmarks done

* Missing file

* Remove stale comments

* Fixes

* Fixes

* Allow for priority queuing.

* Another test and a fix

* Fixes

* Fixes

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

* Grumble

* Update frame/gilt/src/tests.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update frame/gilt/src/tests.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Grumble

* Update frame/gilt/src/tests.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update frame/gilt/src/lib.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update frame/gilt/src/lib.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Fix unreserve ordering

* Grumble

* Fixes

Co-authored-by: Parity Benchmarking Bot <admin@parity.io>
Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/Cargo.lock

@@ -4113,6 +4113,7 @@ dependencies = [
  "pallet-democracy",
  "pallet-election-provider-multi-phase",
  "pallet-elections-phragmen",
+ "pallet-gilt",
  "pallet-grandpa",
  "pallet-identity",
  "pallet-im-online",
@@ -4805,6 +4806,23 @@ dependencies = [
  "sp-tasks",
 ]
 
+[[package]]
+name = "pallet-gilt"
+version = "3.0.0"
+dependencies = [
+ "frame-benchmarking",
+ "frame-support",
+ "frame-system",
+ "pallet-balances",
+ "parity-scale-codec",
+ "serde",
+ "sp-arithmetic",
+ "sp-core",
+ "sp-io",
+ "sp-runtime",
+ "sp-std",
+]
+
 [[package]]
 name = "pallet-grandpa"
 version = "3.0.0"