build: move rxjs dependency out of root #1415

Job	Run time
build	9s
lint	1m 55s
e2e_windows (windows-2025, 22, npm, 1)	40s
e2e_windows (windows-2025, 22, npm, 2)	41s
e2e_windows (windows-2025, 22, npm, 0)	50s
e2e_windows (windows-2025, 22, esbuild, 1)	48s
e2e_windows (windows-2025, 22, esbuild, 5)	42s
e2e_windows (windows-2025, 22, npm, 4)	1m 30s
e2e_windows (windows-2025, 22, npm, 5)	41s
e2e_windows (windows-2025, 22, esbuild, 0)	41s
e2e_windows (windows-2025, 22, esbuild, 4)	41s
e2e_windows (windows-2025, 22, esbuild, 3)	40s
e2e_windows (windows-2025, 22, esbuild, 2)	41s
e2e_windows (windows-2025, 22, npm, 3)	49s
e2e-package-managers	0s
e2e	0s
test	0s
publish-snapshots	0s
Browser Compatibility Tests	0s
e2e-snapshots	-1s
	11m 27s

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