feat: Add propeller swap encoders

- Add setup for package
- Add docs
- Add balancer implementation and test
- Add CI:
  - Add setup action
  - Add test and format CI
- Add CD: Publish python package to AWS

propeller-swap-encoders/propeller_swap_encoders/tests/test_balancer.py

@@ -0,0 +1,48 @@
+from core.models.evm.ethereum_token import EthereumToken
+from propeller_swap_encoders.balancer import BalancerSwapStructEncoder
+
+
+def test_encode_balancer():
+    WETH = EthereumToken(
+        symbol="WETH",
+        address="0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
+        decimals=18,
+        gas=0,
+    )
+    DAI = EthereumToken(
+        symbol="DAI", address="0x6b175474e89094c44da98b954eedeac495271d0f", decimals=18
+    )
+    bob = "0x000000000000000000000000000000000000007B"
+    swap = {
+        "pool_id": "0x06df3b2bbb68adc8b0e302443692037ed9f91b42000000000000000000000063",
+        "sell_token": DAI,
+        "buy_token": WETH,
+        "split": 0,
+        "sell_amount": 0,
+        "buy_amount": 100,
+        "token_approval_needed": False,
+        "pool_tokens": (),
+        "pool_type": "BalancerStablePoolState",
+        "curve_v2_pool_type": None,
+        "is_curve_tricrypto": None,
+        "quote": None,
+        "pool_fee": None,
+    }
+    balancer_encoder = BalancerSwapStructEncoder()
+    encoded = balancer_encoder.encode_swap_struct(swap, receiver=bob, exact_out=False)
+    assert (
+        encoded.hex()
+        ==
+        # sell token
+        "6b175474e89094c44da98b954eedeac495271d0f"
+        # buy token
+        "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
+        # pool address
+        "06df3b2bbb68adc8b0e302443692037ed9f91b42000000000000000000000063"
+        # receiver
+        "000000000000000000000000000000000000007b"
+        # exact_out
+        "00"
+        # token_approval_needed
+        "00"
+    )