fix(libwaku): support string and int64 for timestamps #5873

Job	Run time
changes	4s
build-ubuntu-22.04	21m 26s
build-macos-13	19m 17s
test-ubuntu-22.04	32m 39s
test-macos-13	23m 19s
build-docker-image / docker-build-ubuntu-22.04	4m 52s
js-waku-node / node	6h 0m 13s
js-waku-node-optional / node	1m 46s
Lint	48s
	7h 44m 24s

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