h3/ngtcp2: improve error handling

- identify ngtcp2 and nghttp3 error codes that are fatal
- close quic connection on fatal errors
- refuse further filter operations once connection

h3/ngtcp2: improve error handling

- identify ngtcp2 and nghttp3 error codes that are fatal
- close quic connection on fatal errors
- refuse further filter operations once connection is closed
- confusion about the nghttp3 API. We should close the QUIC stream on
cancel and not use the nghttp3 calls intended to be invoked when the
QUIC stream was closed by the peer.

Closes #13562

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tidy-up: whitespace [ci skip]

CURLINFO_REQUEST_SIZE: fixed, add tests for transfer infos reported

- tests for 'size_request' and other stats reported, for
presence and consistency

Reported-by: Jonatan Vela

CURLINFO_REQUEST_SIZE: fixed, add tests for transfer infos reported

- tests for 'size_request' and other stats reported, for
presence and consistency

Reported-by: Jonatan Vela
Fixes #13269
Closes #13275

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