Dex improvements (#422)

* remove dex traits&balance types

* remove liq tokens pallet in favor of coins-pallet instance

* fix tests & benchmarks

* remove liquidity tokens trait

* fix CI

* fix pr comments

* Slight renamings

* Add burn_with_instruction as a negative to LiquidityTokens CallFilter

* Remove use of One, Zero, Saturating taits in dex pallet

---------

Co-authored-by: Luke Parker <lukeparker5132@gmail.com>

Cargo.lock

@@ -7535,7 +7535,6 @@ dependencies = [
  "parity-scale-codec",
  "scale-info",
  "serai-coins-primitives",
- "serai-dex-primitives",
  "serai-primitives",
  "sp-core",
  "sp-runtime",
@@ -7626,8 +7625,6 @@ dependencies = [
  "parity-scale-codec",
  "scale-info",
  "serai-coins-pallet",
- "serai-dex-primitives",
- "serai-liquidity-tokens-pallet",
  "serai-primitives",
  "sp-api",
  "sp-arithmetic",
@@ -7637,19 +7634,6 @@ dependencies = [
  "sp-std",
 ]
 
-[[package]]
-name = "serai-dex-primitives"
-version = "0.1.0"
-dependencies = [
- "frame-benchmarking",
- "frame-support",
- "parity-scale-codec",
- "scale-info",
- "serai-primitives",
- "sp-runtime",
- "sp-std",
-]
-
 [[package]]
 name = "serai-docker-tests"
 version = "0.1.0"
@@ -7719,20 +7703,6 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "serai-liquidity-tokens-pallet"
-version = "0.1.0"
-dependencies = [
- "frame-support",
- "frame-system",
- "parity-scale-codec",
- "scale-info",
- "serai-dex-primitives",
- "serai-primitives",
- "sp-core",
- "sp-std",
-]
-
 [[package]]
 name = "serai-message-queue"
 version = "0.1.0"
@@ -7947,9 +7917,7 @@ dependencies = [
  "scale-info",
  "serai-coins-pallet",
  "serai-dex-pallet",
- "serai-dex-primitives",
  "serai-in-instructions-pallet",
- "serai-liquidity-tokens-pallet",
  "serai-primitives",
  "serai-signals-pallet",
  "serai-validator-sets-pallet",