[SuperEditor][SuperTextField] Improve RTL support (Resolves #2472) #2956

Job	Run time
analyze_attributed_text	15s
test_attributed_text	19s
analyze_super_text_layout	1m 19s
analyze_super_keyboard	1m 18s
test_goldens_super_editor	1m 52s
test_goldens_super_text_layout	1m 23s
test_linux	5m 9s
test_mac	5m 14s
test_super_editor_markdown	1m 29s
test_super_editor_quill	1m 20s
test_super_keyboard	1m 13s
test_super_text_layout	1m 23s
test_windows	7m 17s
	29m 31s

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