ratelimit timestamps

[icing]

Make timestamp passed for ratelimit checks optional arguments. Let the limit calculation obtain a timestamp when it needs it and none was passed. Most transfers run without active ratelimits and getting a fresh timestamp is unnecessary.

[vszakats]

Perhaps delete the #if 0 branch in Curl_pgrs_now(), or add a comment
why we want to keep it?

[icing]

Perhaps delete the #if 0 branch in Curl_pgrs_now(), or add a comment why we want to keep it?

Flüchtigkeitsfehler...😌

[Copilot]

Pull request overview

This PR makes timestamps optional for rate-limit (token bucket) checks/drains by letting the ratelimit code sample the current time internally when needed, reducing timestamp reads on transfers where rate limiting is inactive. It also updates various call sites accordingly and extends an HTTP test scorecard formatter to display GB/s.

Changes:

• Allow Curl_rlimit_avail() / Curl_rlimit_drain() to accept a NULL timestamp and sample time internally only when rate limiting is active.
• Update multiple protocol/transfer paths to pass NULL timestamps into ratelimit functions.
• Adjust progress timestamp handling and add GB/s formatting support in tests/http/scorecard.py.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/http/scorecard.py	Adds GB/s formatting to the scorecard throughput formatter.
lib/vquic/cf-ngtcp2.c	Switches QUIC RX window updates to call ratelimit availability without a caller-supplied timestamp.
lib/vquic/cf-ngtcp2-proxy.c	Same ratelimit timestamp change for the HTTP/3 proxy QUIC path.
lib/transfer.c	Updates download path ratelimit availability check to omit timestamp.
lib/sendf.c	Updates upload path ratelimit availability check to omit timestamp.
lib/ratelimit.h	Minor signature formatting change for Curl_rlimit_drain() declaration.
lib/ratelimit.c	Implements optional timestamp sampling in Curl_rlimit_avail() and Curl_rlimit_drain().
lib/progress.c	Simplifies Curl_pgrs_now() storage and switches ratelimit drain calls to omit timestamp.
lib/multi.c	Updates pollset adjustment logic to call ratelimit availability without an explicit timestamp.
lib/http2.c	Updates HTTP/2 desired window computation to call ratelimit availability without an explicit timestamp.

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