Extend the debug/zip API to other tools (Lightning, Dumpling, BR)

[kennytm]

Feature Request

Is your feature request related to a problem? Please describe:

The debug/zip HTTP endpoint is only available in TiDB (via #9651 at http://[::]:10080/debug/zip) and PD (via tikv/pd#4017 at http://[::]:2379/debug/pprof/zip).

In all other components (TiKV, BR/Lightning/Dumpling, DM/TiCDC, etc.) one can only retrieve the pprof one by one, which

1. this is very tedious
2. the profiles each require different set of parameters (/profile need ?seconds=N, /goroutine need ?debug=2) which is very error-prone, in particular with the non-CPU profiles accidentally adding ?seconds=N will produce unusable garbage.

Describe the feature you'd like:

Bring the debug/zip API to all mentioned components (this issue is created for BR + Lightning + Dumpling in this repository only).

Describe alternatives you've considered:

Distribute a standardized script to fetch all the pprof.

#!/bin/sh
set -ex

ENDPOINT="$1"
SECONDS="$2"
OUTDIR="$3"

mkdir -p "$OUTDIR"
curl -o "$OUTDIR/goroutine" "$ENDPOINT/debug/pprof/goroutine?debug=2"
curl -o "$OUTDIR/heap" "$ENDPOINT/debug/pprof/heap?gc=1"
curl -o "$OUTDIR/mutex" "$ENDPOINT/debug/pprof/mutex"
curl -o "$OUTDIR/profile" "$ENDPOINT/debug/pprof/profile?seconds=$SECONDS"

This can only download the pprof profiles. The debug/zip output also contained the config and version, which may or may not be useful.

Teachability, Documentation, Adoption, Migration Strategy:

Note that TiDB's /debug/zip and PD's /debug/pprof/zip themselves are not yet documented anywhere in PingCAP's docs website. So these can be grouped together to introduce as a standardized debug interface for all PingCAP components. (Not sure about how to resolve the difference between TiDB and PD's URL)