Improve `GT.save()` usability #2147

Job	Run time
Test for saving table image with browser	2m 47s
test-pandas	41s
build (3.9)	1m 17s
test-windows	4m 48s
build (3.10)	1m 19s
build (3.11)	1m 8s
build (3.12)	1m 11s
build (3.13)	1m 30s
Release to pypi	0s
	14m 41s

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