feat: add batchGetEffectiveIamPolicies sample code.

[aaronlichen-hp]

Add batchGetEffectiveIamPolicies sample code and also lint the protobuf
imports.

Fixes #653 🦕

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• samples/getBatchEffectiveIamPolicies.js:23, tag asset_quickstart_batch_get_effective_iam_policies

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[danielbankhead]

Apologies, let's add {depth: null} here

Suggested change

	console.dir(result);
	console.dir(result, {depth: null});

[generated-files-bot]

Warning: This pull request is touching the following templated files:

• README.md - README.md is managed by synthtool. However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/main/.readme-partials.yaml
• samples/README.md - samples/README.md is managed by synthtool. However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/main/.readme-partials.yaml