Add json analysis output option suitable for parsing with jq.

[John Suykerbuyk]

I've an ugly bit of bash script that can convert most of the warp analyze output into csv files suitable for importing into spreadsheets, but it would be much more robust and less error prone if the warp analyze output was in json.

#!/bin/bash

for OP in get put delete
do
for TST in $(ls ${OP}.zst)
do
prefix="$(echo $TST | sed 's/.csv.zst//g' | sed 's/-/, /g')"
echo -n "$prefix, $TST, "; warp analyze $TST
| grep 'Operation:' -A 1
| tail -1; done
| sed 's/ Average: //g'
done
https://drive.google.com/file/d/1npvAAj7qb5GjQYJ_a5Znij4xN_n-PENQ/view?usp=sharing

A sample output file from the above script can be found here:
https://drive.google.com/file/d/1npvAAj7qb5GjQYJ_a5Znij4xN_n-PENQ/view?usp=sharing

[Klaus Post]

@suykerbuyk Use --json parameter, eg warp analyze --json after.csv.zst >analysis.json