Refactor margin usage logging and update enum classes to StrEnum

This commit improves the logging format for margin usage in the market maker bot and updates the Network and CompatVersion classes to inherit from StrEnum for better string representation. These changes enhance code clarity and maintainability.

Author: WGB5445

examples/write/market_maker_bot.py

@@ -9,10 +9,10 @@
 from aptos_sdk.ed25519 import PrivateKey
 
 from decibel import (
+    NAMED_CONFIGS,
     BaseSDKOptions,
     DecibelWriteDex,
     GasPriceManager,
-    NAMED_CONFIGS,
     PlaceOrderSuccess,
     TimeInForce,
     amount_to_chain_units,
@@ -237,12 +237,12 @@ async def _run_cycle(
     print(
         f"\n[cycle {cycle}] mid={mid if mid is not None else 'N/A'} "
         f"inventory={inventory:+.6f} "
-        f"margin={margin_usage*100:.2f}% open_orders={len(open_order_ids)}"
+        f"margin={margin_usage * 100:.2f}% open_orders={len(open_order_ids)}"
     )
 
     if margin_usage > settings.max_margin_usage:
         print(
-            f"  paused: margin {margin_usage*100:.2f}% > {settings.max_margin_usage*100:.2f}%"
+            f"  paused: margin {margin_usage * 100:.2f}% > {settings.max_margin_usage * 100:.2f}%"
         )
         return
     if mid is None:

src/decibel/_constants.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
-from enum import Enum
+from enum import StrEnum
 
 from aptos_sdk.account_address import AccountAddress
 
@@ -32,13 +32,13 @@
 DEFAULT_TXN_SUBMIT_TIMEOUT = 10.0
 
 
-class Network(str, Enum):
+class Network(StrEnum):
     MAINNET = "mainnet"
     TESTNET = "testnet"
     CUSTOM = "custom"
 
 
-class CompatVersion(str, Enum):
+class CompatVersion(StrEnum):
     V0_4 = "v0.4"  # decibel-testnet-release-v0.4 - and final version.