http: h1/h2 proxy unification

- use shared code for setting up the CONNECT request
when tunneling, used in HTTP/1.x and HTTP/2 proxying
- eliminate use of Curl_buffer_send() and ot

http: h1/h2 proxy unification

- use shared code for setting up the CONNECT request
when tunneling, used in HTTP/1.x and HTTP/2 proxying
- eliminate use of Curl_buffer_send() and other manipulations
of `data->req` or `data->state.ulbuf`

Closes #11808

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http2: raise header limitations above and beyond

- not quite to infinity
- rewrote the implementation of our internal HTTP/1.x request
parsing to work with very large lines using d

http2: raise header limitations above and beyond

- not quite to infinity
- rewrote the implementation of our internal HTTP/1.x request
parsing to work with very large lines using dynbufs.
- new default limit is `DYN_HTTP_REQUEST`, aka 1MB, which
is also the limit of curl's general HTTP request processing.

Fixes #11405
Closes #11407

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lib: rename struct 'http_req' to 'httpreq'

Because FreeBSD 14 kidnapped the name.
Ref: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271526

Fixes #11163
Closes #11164

http2: double http request parser max line length

This works around #11138, by doubling the limit, and should be a
relatively safe fix.

Ideally the buffer would grow as needed a

http2: double http request parser max line length

This works around #11138, by doubling the limit, and should be a
relatively safe fix.

Ideally the buffer would grow as needed and there would be no need for a
limit? But that might be follow-up material.

Fixes #11138
Closes #11139

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http2: support HTTP/2 to forward proxies, non-tunneling

- with `--proxy-http2` allow h2 ALPN negotiation to
forward proxies
- applies to http: requests against a https: proxy only,

http2: support HTTP/2 to forward proxies, non-tunneling

- with `--proxy-http2` allow h2 ALPN negotiation to
forward proxies
- applies to http: requests against a https: proxy only,
as https: requests will auto-tunnel
- adding a HTTP/1 request parser in http1.c
- removed h2h3.c
- using new request parser in nghttp2 and all h3 backends
- adding test 2603 for request parser
- adding h2 proxy test cases to test_10_*

scorecard.py: request scoring accidentally always run curl
with '-v'. Removed that, expect double numbers.

labeller: added http1.* and h2-proxy sources to detection

Closes #10967

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