[AI-FSSDK] prepare for release javascript-sdk v6.4.0 #1555

Job	Run time
lint	1m 2s
browser_tests (edge)	7m 51s
typescript_test	1m 37s
browser_tests (firefox)	9m 28s
browser_tests (chrome)	8m 20s
unit_tests (20)	1m 18s
integration_tests / test	7s
unit_tests (18)	1m 44s
unit_tests (22)	1m 28s
fullstack_production_suite / test	5s
browser_tests (safari)	4m 27s
lint_markdown_files / lint	1m 16s
unit_tests (24)	1m 26s
Coveralls coverage	5s
	40m 14s

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