chore(packages): set sideEffects metadata

[kuhe]

Description

sets bundler sideEffects metadata explicitly on our packages. The packages for which it is true are:

util-endpoints: adds additional functions to the endpoint lib object
crc64-nvme-crt: adds an impl to a dependency container
signature-v4-crt: adds an impl to a dependency container
crt-loader: flips a flag on a dependency container
signature-v4a: because it aliases @smithy/signature-v4a and is meant to be imported as a statement.

// e.g.
import "@aws-sdk/signature-4a";

There's no significant effect on our bundler size benchmarks.

Testing

let CI run

Checklist

• If the PR is a feature, add integration tests (*.integ.spec.ts).
• If you wrote E2E tests, are they resilient to concurrent I/O?
• If adding new public functions, did you add the @public tag and enable doc generation on the package?

[github-actions]

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