Add balancer vault artifact (#630)

This PR refactors how the artifact vendoring works in order to add new Balancer Vault contract. In particular this PR:
- Strips even more JSON artifact properties that aren't used, namely:
  - `contractName`: the build script was overriding the contract name for all generated bindings
  - `networks`: they were being set for all contracts that we needed `Contract::deployed()` for (with the exception of WETH, but that was a very small amount of data to add).
  - `bytecode`: For contracts that are only needed as an interface and are not deployed for E2E
- Creates `Sushiswap*` to `UniswapV2` symbolic links
  - This is done because they share an interface
  - The Sushiswap contracts weren't getting automatically vendored by the `vendor.rs` script.
  
Furthermore, two contracts for which we had bindings but are unused have been removed (`UniswapV2Pair` and `SushiswapV2Pair`, since we use `IUniswapLikePair` for both those contracts).

### Test Plan

Added new tests to ensure that contracts have deployment information configured for all networks that we care about (to avoid another incident like we had in staging this morning).

Otherwise, no service changes, so CI will hopefully catch all issues.

contracts/Cargo.toml

@@ -36,7 +36,7 @@ ethcontract-generate = { version = "0.11", optional = true}
 filetime = { version = "0.2.14", optional = true }
 log = { version = "0.4", optional = true }
 serde_json = { version = "1.0", optional = true }
-tokio = { version = "0.2", optional = true, features = ["macros"] }
+tokio = { version = "0.2", optional = true, features = ["macros", "time"] }
 
 [build-dependencies]
 ethcontract-generate = "0.11"

contracts/artifacts/IUniswapLikePair.json

@@ -1 +1 @@
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