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Add HTTPBandwidth/HTTPBandwidthWithDialAddr probe classes that download a fixed number of bytes and record transfer time and bytes transferred as Prometheus counters for bandwidth measurement, plus HTTPWithDialAddr and the shared NewProbeTransport and HTTPBandwidthMetrics helpers. The dial-address override lets a probe target a specific backend (e.g. a single Funnel ingress node) while SNI, the Host header, and TLS cert validation continue to derive from the URL host. HTTPBandwidthMetrics is exported so other bandwidth probes (e.g. a receiver-reported upload probe) emit an identical metric set and compare under a shared direction label. Updates tailscale/corp#41587 Signed-off-by: Mike O'Driscoll <mikeo@tailscale.com>