expose http SETTINGS_HEADER_TABLE_SIZE option to user

[MoZhonghua]

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Use case(s) - what problem will this feature solve?

We want to copy grpc stream from product enviroment to test enviroment using libpcap:

1. capture packet using libpcap
2. parse http2 frame and extract grpc request data
3. forward this request data to test environment

This is almost impossbile if http2 uses a dynamic header table for following reasons:

• we must capture full tcp stream from first packet
• we must NOT lost any packet of, or the dynamic tables will mismatch

Proposed Solution

We already has http2 settings related options, such as MaxHeaderListSize.
Just add an new grpc server option to disable dynamic header table, so we can disable
http2 dynamic header by setting SETTINGS_HEADER_TABLE_SIZE to 0.

We will send more data for requests in product env, less than 150 bytes for each requests in
our environment. This is ok for us because we only disable dynamic header table when we
need copy stream.

Alternatives Considered

Additional Context

[stale]

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