A Social Account Recovery Pallet (#4531)

* Initial sketch of social recovery pallet

* Fix compilation issues

* Use a single total delay, rename stuff

* Check possible overflow

* Copyright bump

* Add mock for tests

* Add basic end to end test

* Add `create_recovery` tests

* Add malicious recovery lifecycle test

* Make clear we check for sorted and unique friends

* Work on some tests, clean up imports

* Change `if let Some(_)` to `ok_or()`

* More tests

* Finish tests, except issue with `on_free_balance_zero`

* Fix `on_free_balance_zero`

* Pallet docs

* Add function/weight docs

* Fix merge master

* OnReapAccount for System too

* Update weight docs

* Allow passthrough to support fee-less extrinsics

substrate/Cargo.lock

@@ -3894,6 +3894,22 @@ dependencies = [
  "sp-std 2.0.0",
 ]
 
+[[package]]
+name = "pallet-recovery"
+version = "2.0.0"
+dependencies = [
+ "enumflags2 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "frame-support 2.0.0",
+ "frame-system 2.0.0",
+ "pallet-balances 2.0.0",
+ "parity-scale-codec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.103 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sp-core 2.0.0",
+ "sp-io 2.0.0",
+ "sp-runtime 2.0.0",
+ "sp-std 2.0.0",
+]
+
 [[package]]
 name = "pallet-scored-pool"
 version = "2.0.0"