http2: improve rate limiting of downloads

Set the initial stream window size to 64KB and increase that to the 10MB
we used to start with on the first server reply, unless a rate limit is

http2: improve rate limiting of downloads

Set the initial stream window size to 64KB and increase that to the 10MB
we used to start with on the first server reply, unless a rate limit is
in effect.

Continously monitory changes to the transfers rate limit and adjust the
stream window size accordingly. `max_recv_speed` is a transfer propert
that can be changed during processing by a callback.

Closes #14326

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http: only act on 101 responses when they are HTTP/1.1

For 101 responses claiming to be any other protocol, bail out. This
would previously trigger an assert.

Add test 1704 to v

http: only act on 101 responses when they are HTTP/1.1

For 101 responses claiming to be any other protocol, bail out. This
would previously trigger an assert.

Add test 1704 to verify.

Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=66184
Closes #12811

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