dtl: use `ethers.StaticJsonRpcProvider` to reduce `eth_chainId` requests

There is no need to query for the chain id over and over again
when syncing from L2 using the DTL. This also reduces the amount
of logs for the `docker-compose` setup and will save requests to
the sequencer in production.

.changeset/happy-candles-burn.md

+---
+'@eth-optimism/data-transport-layer': patch
+---
+
+Use ethers.StaticJsonRpcProvider for the L2 Provider to lower API requests

packages/data-transport-layer/src/services/l2-ingestion/service.ts

 /* Imports: External */
 import { BaseService, Metrics } from '@eth-optimism/common-ts'
-import { JsonRpcProvider } from '@ethersproject/providers'
+import { StaticJsonRpcProvider } from '@ethersproject/providers'
 import { BigNumber } from 'ethers'
 import { LevelUp } from 'levelup'
 import axios from 'axios'
@@ -72,7 +72,7 @@ export class L2IngestionService extends BaseService<L2IngestionServiceOptions> {
 
   private state: {
     db: TransportDB
-    l2RpcProvider: JsonRpcProvider
+    l2RpcProvider: StaticJsonRpcProvider
   } = {} as any
 
   protected async _init(): Promise<void> {
@@ -88,7 +88,7 @@ export class L2IngestionService extends BaseService<L2IngestionServiceOptions> {
 
     this.state.l2RpcProvider =
       typeof this.options.l2RpcProvider === 'string'
-        ? new JsonRpcProvider(this.options.l2RpcProvider)
+        ? new StaticJsonRpcProvider(this.options.l2RpcProvider)
         : this.options.l2RpcProvider
   }