feat: add deposit functionality to Gateway contract #47
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This commit adds a new function
deposit
to the Gateway contract, allowing providers to deposit assets. The function requires the amount to be greater than 0, and the asset to be supported. It also requires the provider to approve the Gateway contract on the token of at least the specified amount before calling the function. The function transfers the specified amount of tokens from the sender to the Gateway contract and updates the deposited balances accordingly. The commit also includes tests for the deposit functionality.closes #45