modify random wallet generation BaseProvider.ts

[madschristensen99]

Description

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[awisniew207]

During my testing, the only change that should be need to the js-sdk in this PR is changing the LitContracts config:

From:

    const litContracts = new LitContracts({
      randomPrivatekey: true,
      network: this.litNodeClient.config.litNetwork,
    });

To:

    const litContracts = new LitContracts({
      signer: new ethers.Wallet(ethers.Wallet.createRandom().privateKey, new ethers.providers.JsonRpcProvider(LIT_RPC.CHRONICLE_YELLOWSTONE)),
      network: this.litNodeClient.config.litNetwork,
    });

[awisniew207]

lgtm! 👍 This solution will prevent a wallet extension from opening in the browser.

A more thorough fix would be refactoring the randomPrivatekey flag to do this, but I don't think that is a must here.