Feature Request: Support custom max_headers_count and max_request_headers_kb

[zjjblue]

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Tell us about your request
We got 431 error code from envoy, from envoy doc, this was caused by max_headers_count and max_request_headers_kb restrict, so we need to increase the limit count.

Which integration(s) is this request for?
We're using AppMesh with ECS Fargate Services.

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?
We want to increase the limit by config, but Appmesh has no extension points to configure related configurations.

Are you currently working around this issue?
We have no idea to solve the issue,but istio could config the configuration by EnvoyFilter.

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