Refactor get/set/add methods in `GFEntity` and `GFComponent` #377

Job	Run time
data	1s
compile_glecs (linux, x86_64, libglecs.linux.template_debug.x86_64.so, ubuntu-latest)	8m 38s
compile_glecs (macos, x86_64, libglecs.macos.template_debug.x86_64.dylib, macos-13)	18m 52s
compile_glecs (windows, windows, x86_64, libglecs.windows.template_debug.x86_64.dll, windows-latest)	11m 34s
run_test_suite (ubuntu-latest, bin.linux_x86_64.dfba20f861071276954d86ac5e563cc52924e3e10088ce6c2...	42s
run_test_suite (windows-latest, bin.windows_x86_64.a66ded5fa6c15e1e9d99664e1dc48644850e70a00e3608...	1m 14s
update_nightly	0s
	41m 1s

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