Add Type Hints to MDAnalysis.analysis.rms #7627

Job	Run time
build_docs	4m 13s
sdist_check_and_build	8m 53s
main_tests (ubuntu-latest, 3.11, false, false, cython>=3.1, python_311_nocov)	7m 22s
main_tests (ubuntu-latest, 3.14, false, false, cython>=3.1, python_314_nocov)	8m 34s
main_tests (ubuntu-latest, 3.11, true, false, asv_check, asv)	2m 40s
main_tests (ubuntu-latest, 3.12, true, true, cython<3.1)	43m 52s
main_tests (ubuntu-latest, 3.11, true, true, cython<3.1)	23m 28s
main_tests (ubuntu-latest, 3.11, false, true, cython<3.1, numpy_min, numpy=1.26.0)	14m 39s
main_tests (macOS-14, 3.13, false, true, cython<3.1, macOS_14_arm64_py313)	13m 57s
main_tests (ubuntu-latest, 3.13, true, true, cython<3.1)	23m 17s
	2h 30m 55s

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