Verify Proxy Contract

[DennisPitallano]

Submits a proxy contract source code to Etherscan for verification.

1. Requires a valid BscScan API key, it will be rejected otherwise
2. Current daily limit of 100 submissions per day per user (subject to change)
3. Only supports HTTP post
4. Upon successful submission, you will receive a GUID (50 characters) as a receipt
5. You may use this GUID to track the status of your submission
6. Verified proxy contracts will display the "Read/Write as Proxy" of the implementation contract under the contract address's contract tab