feat(ai): introduce AIServiceRegistry contract

This commit adds the AIServiceRegistry contract, facilitating the
registration and discoverability of AI subnet orchestrators'
services. As discussed in #642, we've chosen to deploy a
non-upgradable contract for now, linked to LivePeer's mainnet
controller (https://docs.livepeer.org/references/contract-addresses).

deploy/deploy_ai_service_registry.ts

@@ -0,0 +1,21 @@
+import {HardhatRuntimeEnvironment} from "hardhat/types"
+import {DeployFunction} from "hardhat-deploy/types"
+
+const func: DeployFunction = async function(hre: HardhatRuntimeEnvironment) {
+    const {deployments, getNamedAccounts} = hre
+    const {deploy} = deployments
+
+    const {deployer} = await getNamedAccounts()
+
+    const controllerDeployment = await deployments.get("Controller")
+
+    const deployResult = await deploy("ServiceRegistry", {
+        from: deployer,
+        args: [controllerDeployment.address],
+        log: true
+    })
+    await deployments.save("AIServiceRegistry", deployResult)
+}
+
+func.tags = ["AI_SERVICE_REGISTRY"]
+export default func