fix: Try to lessen Linea finalizer RPC burden

[pxrl]

The Linea SDK implements some unfortunate RPC queries that are not well-suited to being called in parallel. This seems to be resulting in errors being returned by upstream RPC providers. Serialise some queries, with a longer delay on retry, in order to try to lessen the load and reduce the error rate. This will inevitably lead to a longer execution time, but might help to save the bot from throwing.

[james-a-morris]

Side thought: we can just override the rpc provider that is set in the constructor. Here's what the constructor SDK looks like in JS:

    constructor(options) {
        this.network = options.network;
        this.mode = options.mode;
        this.l2MessageTreeDepth = options.l2MessageTreeDepth ?? constants_1.DEFAULT_L2_MESSAGE_TREE_DEPTH;
        if (options.mode === "read-write") {
            this.l1SignerPrivateKey = options.l1SignerPrivateKey;
            this.l2SignerPrivateKey = options.l2SignerPrivateKey;
            this.maxFeePerGas = options.feeEstimatorOptions?.maxFeePerGas;
            this.gasFeeEstimationPercentile = options.feeEstimatorOptions?.gasFeeEstimationPercentile;
        }
        this.l1Provider = new ProviderService_1.default(options.l1RpcUrl);
        this.l2Provider = new ProviderService_1.default(options.l2RpcUrl);
    }

and ProviderService is:

import { ethers } from "ethers";
import { JsonRpcProvider } from "@ethersproject/providers";
export default class ProviderService {
    provider: JsonRpcProvider;
    constructor(rpcUrl: string);
    getSigner(privateKey: string): ethers.Signer;
}

with it's JS being:

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const ethers_1 = require("ethers");
const providers_1 = require("@ethersproject/providers");
class ProviderService {
    constructor(rpcUrl) {
        this.provider = new providers_1.JsonRpcProvider(rpcUrl);
    }
    getSigner(privateKey) {
        try {
            return new ethers_1.Wallet(privateKey, this.provider);
        }
        catch (e) {
            throw new Error("Something went wrong when trying to generate Wallet. Please check your private key and the provider url.");
        }
    }
}
exports.default = ProviderService;

We can probably create a class identical to ProviderService, create two instances of it and override the state set by the constructor with:

    (sdk as unknown as Record<string, unknown>)["l1Provider"] = new ProviderService( <- with our RPC provider)`

[james-a-morris]

#1740 (comment)

[pxrl]

Closing this now because we haven't seen any issues for a long time.