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

.github/labeler.yml

@@ -156,8 +156,9 @@ HTTP:
 - all: ['docs/libcurl/opts/CURLOPT_TRAILER*']
 - all: ['docs/libcurl/opts/CURLOPT_TRANSFER_ENCODING*']
 - all: ['lib/cf-https*']
+- all: ['lib/cf-h1*']
+- all: ['lib/cf-h2*']
 - all: ['lib/cookie.*']
-- all: ['lib/h2h3.*']
 - all: ['lib/http*']
 - all: ['tests/http*']
 - all: ['tests/http-server.pl']