Enable dynamic modules

[bpalermo]

What this PR does / why we need it:
Since version 1.34 Envoy supports dynamic modules.

Enabling this extension will allow more performant filter integration.

Special notes for your reviewer:
This has the benefit of allow customers not having to maintain a custom build.

[istio-testing]

Hi @bpalermo. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[zirain]

/ok-to-test

[keithmattix]

I think we want to discuss this a bit. Can you post in Slack or add a topic to the weekly WG meeting?