http_inspector cannot handle valid HTTP inspection that requires >8192 bytes to resolve

[howardjohn]

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Title: http_inspector cannot handle valid HTTP inspection that requires >8192 bytes to resolve

Description:
We discovered an issue in the http_inspector where requests that are valid HTTP but exceed 8192 bytes cause the filter execution to hang.

You can see we will hit this code path at which point we have stopped iteration, but we are also at the max size we are willing to read.

Contrast this to the TLS Inspector code which dynamically changes how much it will read.

Repro steps:
Send a request with an >8192 byte url. I used the query param, not sure it matters

[kyessenov]

CC @briansonnenberg since you were looking into hardening the extension.