refactor: Simplify inventory client parsing

This helps to drop an UMA dependency, and is arguably nicer because it
doesn't corce the js Object to and from a string type.

src/relayer/RelayerConfig.ts

@@ -65,7 +65,10 @@ export class RelayerConfig extends CommonConfig {
     this.slowDepositors = SLOW_DEPOSITORS
       ? JSON.parse(SLOW_DEPOSITORS).map((depositor) => ethers.utils.getAddress(depositor))
       : [];
-    this.inventoryConfig = RELAYER_INVENTORY_CONFIG ? JSON.parse(RELAYER_INVENTORY_CONFIG) : {};
+    this.inventoryConfig = JSON.parse(
+      RELAYER_INVENTORY_CONFIG.replace(/0x[a-fA-F0-9]{40}/g, ethers.utils.getAddress)
+      ?? "{}"
+    );
     this.minRelayerFeePct = toBNWei(MIN_RELAYER_FEE_PCT || Constants.RELAYER_MIN_FEE_PCT);
 
     if (Object.keys(this.inventoryConfig).length > 0) {