Add A tutorial on Kalman filter and Gaussian process equivalents #755

Job	Run time
format	1m 9s
osx-clang	13m 13s
bazel	8m 15s
clang-tidy	43s
ubuntu-build-documentation	1m 12s
ubuntu-clang14	9m 10s
ubuntu-clang14-sanitizers (address-undefined-leak, ./ci/run_address_sanitizer_tests.sh)	14m 4s
ubuntu-gcc11	10m 11s
ubuntu-clang14-sanitizers (thread, ./ci/run_thread_sanitizer_tests.sh)	13m 0s
	1h 10m 57s

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