Imagick::writeImagesFile supporting format parameter #2196

Job	Run time
Run cs-fixer and stubs structure tests	7m 37s
Run tests against php 5.6	8m 9s
Run tests against php 7.0	9m 46s
Run tests against php 7.1	9m 32s
Run tests against php 7.2	10m 7s
Run tests against php 7.3	10m 40s
Run tests against php 7.4	10m 26s
Run tests against php 8.0	12m 17s
Run tests against php 8.1	12m 14s
Run tests against php 8.2	12m 35s
Run tests against php 8.3	12m 32s
Run tests against php 8.4	12m 47s
	2h 8m 42s

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