0x Excluded Sources Configuration

[nlordell]

Fixes #243

This PR extends the 0x API implementation to allow setting excluded sources for /swap and /quote queries and adds configuration options in the driver and orderbook for setting these excluded sources.

Test Plan

Added a new test to see if 0x takes different routes when buying SNX for route (i.e. it doesn't use the "bad" Balancer pool):

% cargo test -p shared -- --ignored --nocapture zeroex_api::tests::excluded_sources
    Finished test [unoptimized + debuginfo] target(s) in 0.10s
     Running unittests src/lib.rs (target/debug/deps/shared-5653717641331484)

running 1 test
[crates/shared/src/zeroex_api.rs:526] &swap = Ok(
    SwapResponse {
        price: PriceResponse {
            sell_amount: 1000000000000000000000,
            buy_amount: 508509876034390373504047,
            allowance_target: 0xdef1c0ded9bec7f1a1670819833240f027b25eff,
            price: 508.5098760343904,
            estimated_gas: 1382394,
        },
        to: 0xdef1c0ded9bec7f1a1670819833240f027b25eff,
        data: 0x...ba12222222228d8ba445958a75a0704d566bf2c8...,
        value: 0,
    },
)
[crates/shared/src/zeroex_api.rs:535] &swap = Ok(
    SwapResponse {
        price: PriceResponse {
            sell_amount: 1000000000000000000000,
            buy_amount: 412021081473199945924709,
            allowance_target: 0xdef1c0ded9bec7f1a1670819833240f027b25eff,
            price: 412.02108147319996,
            estimated_gas: 1282394,
        },
        to: 0xdef1c0ded9bec7f1a1670819833240f027b25eff,
        data: 0x...,
        value: 0,
    },
)
test zeroex_api::tests::excluded_sources ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 254 filtered out; finished in 2.63s

Notice that the results are different in both cases and that when Balancer_V2 is excluded, the calldata no longer contains the 0xba1222.... Vault address.