ENH leverage FormData to support file upload #1694

Job	Run time
CI / Generate matrix	30s
CI / Context	1s
CI / Check governance	0s
CI / 8.1 prf-low mysql57 phpunit all	2m 5s
CI / 8.2 mariadb phpunit all	1m 54s
CI / 8.3 mysql80 phpunit all	2m 41s
CI / 8.1 mysql57 phplinting	1m 34s
CI / 8.1 mysql57 endtoend root job1	10m 26s
CI / 8.3 mysql80 endtoend root job1	10m 57s
CI / 8.1 mysql57 endtoend root job2	8m 6s
CI / 8.3 mysql80 endtoend root job2	7m 55s
CI / 8.1 mysql57 endtoend root job3	8m 41s
CI / 8.3 mysql80 endtoend root job3	8m 51s
CI / 8.1 mysql57 js	5m 20s
CI / Dispatch tag patch release	0s
	1h 9m 1s

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