Vic en feat/pancake swap v3

[fengtality]

Before submitting this PR, please make sure:

• Your code builds clean without any errors or warnings
• You are using approved title ("feat/", "fix/", "docs/", "refactor/")

A description of the changes proposed in the pull request:

• Resolved merge conflicts with development

[fengtality]

I encountered the following error when fetching allowances for an address on pancakeswapLP connector:

{
    "message": "The spender param is not a valid Ethereum address (0x followed by 40 hexidecimal characters).",
    "httpErrorCode": 404,
    "errorCode": -1,
    "stack": "Error: The spender param is not a valid Ethereum address (0x followed by 40 hexidecimal characters).\n    at throwIfErrorsExist (/Users/feng/Code/gateway/dist/src/services/validators.js:38:15)\n    at /Users/feng/Code/gateway/dist/src/services/validators.js:103:40\n    at EVMController.<anonymous> (/Users/feng/Code/gateway/dist/src/chains/ethereum/evm.controllers.js:155:65)\n    at Generator.next (<anonymous>)\n    at /Users/feng/Code/gateway/dist/src/chains/ethereum/evm.controllers.js:8:71\n    at new Promise (<anonymous>)\n    at __awaiter (/Users/feng/Code/gateway/dist/src/chains/ethereum/evm.controllers.js:4:12)\n    at EVMController.allowances (/Users/feng/Code/gateway/dist/src/chains/ethereum/evm.controllers.js:154:16)\n    at /Users/feng/Code/gateway/dist/src/chains/chain.controller.js:49:51\n    at Generator.next (<anonymous>)"
}

Same issue occurs when running /chain/approve with pancakeswapLP as spender.

Since Hummingbot checks allowances, I get this error on startup

[vic-en]

@fengtality I updated the branch and reopened a pr with complete solution - #247