User needs to approve the DSProxy to pull the _tokenAddr tokens
Input:
/// @param market Address provider for specific market
/// @param tokenAddr The address of the token to be paid back
/// @param amount Amount of tokens to be paid back
/// @param rateMode Type of borrow debt Stable: 1, Variable: 2
/// @param from Where are we pulling the payback tokens amount from
/// @param onBehalf On behalf of the address we are borrowing, defaults to proxy
struct Params {
address market;
address tokenAddr;
uint256 amount;
uint256 rateMode;
address from;
address onBehalf;
}