Offboard/clean up Oasis, CoFix, and legacy Kyber [TKR-405] (#482)

* Remove Oasis

* Remove CoFix code

* Remove MixinKyber

* Remove Kyber from asset-swapper

* Delete unused imports, interface, and etc.

* Fix the test failure issue when it's run with neon-router

* Update CHANGELOG.json

packages/protocol-utils/src/transformer_utils.ts

@@ -114,16 +114,13 @@ export enum BridgeProtocol {
     UniswapV2,
     Uniswap,
     Balancer,
-    Kyber,
     Mooniswap,
     MStable,
-    Oasis,
     Shell,
     Dodo,
     DodoV2,
     CryptoCom,
     Bancor,
-    CoFiX,
     Nerve,
     MakerPsm,
     BalancerV2,