ext_proc http bytes tracking support #37297
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This is a follow up PR of: #35740.
This PR added the bytes tracking support for ext_proc http service, which basically is counting how many bytes are sent to and received from ext_proc HTTP service.
It takes the stream_info from the active HTTP request, and saved in the ext_proc filter. When the external processing completes, the bytes counters from the stream_info are retrieved and stored into the filter state.
The existing logging test filter is leveraged to test the byte counters in the filter state are correctly updated.