Enable teleport of native token to Assethub (#553)

* Adjust xcm_config.rs for Pendulum and allow teleport of PEN to assethub

* Implement xcm-teleport pallet

* Add xcm-teleport pallet to pendulum runtime

* Adjust xcm-teleport pallet to deposit leftover DOT back into sovereign account

* Adjust config in pendulum runtime

* Implement teleport check-in and check-out logic in custom transactor

* Implement teleport destination validation in custom transactor

* Rename variables

* Address review comments: remove unused deps, fix imbalance handling, update comments (#554)

* Initial plan

* Address review comments: remove unused deps, fix comment, handle imbalance properly

Co-authored-by: ebma <6690623+ebma@users.noreply.github.com>

* Clarify comment about refund limitations

Co-authored-by: ebma <6690623+ebma@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: ebma <6690623+ebma@users.noreply.github.com>

* Revert UnitWeightCost change

* Add minimum teleport amount to prevent griefing attacks

* Add logic to convert between PEN and DOT price using onchain prices

* Fix `vec!` missing

* Deposit leftover DOT to beneficiary

* Reduce MaxDotFeeAmount to 0.5

* Adjust stale code

---------

Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
Co-authored-by: ebma <6690623+ebma@users.noreply.github.com>

Author: ebma

Cargo.lock

@@ -13,6 +13,7 @@ members = [
     "pallets/orml-currencies-allowance-extension",
     "pallets/orml-tokens-management-extension",
     "pallets/treasury-buyout-extension",
+    "pallets/xcm-teleport",
     "runtime/common",
     "runtime/amplitude",
     "runtime/foucoco",

Cargo.toml

@@ -0,0 +1,47 @@
+[package]
+authors = ["Pendulum"]
+description = "A pallet to teleport native PEN to AssetHub with correct XCM message ordering"
+edition = "2021"
+name = "pallet-xcm-teleport"
+version = "1.6.0-d"
+
+[dependencies]
+log = { workspace = true }
+parity-scale-codec = { workspace = true, features = ["derive"] }
+scale-info = { workspace = true, features = ["derive"] }
+
+frame-support = { workspace = true }
+frame-system = { workspace = true }
+sp-runtime = { workspace = true }
+sp-std = { workspace = true }
+
+xcm = { workspace = true }
+
+# benchmarking
+frame-benchmarking = { workspace = true, optional = true }
+
+[features]
+default = ["std"]
+runtime-benchmarks = [
+	"frame-benchmarking",
+	"frame-benchmarking/runtime-benchmarks",
+	"frame-support/runtime-benchmarks",
+	"frame-system/runtime-benchmarks",
+	"sp-runtime/runtime-benchmarks",
+]
+std = [
+	"frame-support/std",
+	"frame-system/std",
+	"log/std",
+	"parity-scale-codec/std",
+	"scale-info/std",
+	"sp-runtime/std",
+	"sp-std/std",
+	"xcm/std",
+	"frame-benchmarking?/std",
+]
+try-runtime = [
+	"frame-support/try-runtime",
+	"frame-system/try-runtime",
+	"sp-runtime/try-runtime",
+]