Add SP800-108 KDF modes #1153

Job	Run time
build_python_27 (ubuntu-22.04, no)	2m 47s
mypy	18s
python_no_gil	5m 42s
build_python_27 (windows-latest, no)	4m 17s
build_python_27 (windows-latest, yes)	4m 37s
test_c_linux (1, x64)	57s
test_c_windows (windows-latest, x64)	44s
test_c_linux (0, x64)	1m 1s
build_python_27 (ubuntu-22.04, yes)	2m 51s
test_c_windows (windows-11-arm, arm64)	52s
test_c_linux (1, x32)	1m 24s
test_c_windows (windows-latest, win32)	1m 25s
test_c_linux (0, x32)	1m 10s
build (3.7, yes, ubuntu-22.04)	2m 48s
build (3.8, no, ubuntu-22.04)	2m 38s
build (3.7, no, ubuntu-22.04)	2m 43s
build (3.8, yes, ubuntu-22.04)	2m 32s
build (3.9, no, ubuntu-22.04)	4m 53s
build (3.10, no, ubuntu-22.04)	4m 53s
build (3.10, yes, ubuntu-22.04)	4m 50s
build (3.9, yes, ubuntu-22.04)	5m 1s
build (3.12, no, ubuntu-22.04)	4m 41s
build (3.12, yes, ubuntu-22.04)	4m 44s
build (3.13, no, windows-11-arm)	4m 42s
build (3.13, no, windows-latest)	4m 20s
build (3.11, yes, ubuntu-22.04)	4m 40s
build (3.13, yes, ubuntu-22.04)	4m 41s
build (3.13, no, ubuntu-22.04)	4m 45s
build (pypy2.7, no, ubuntu-latest)	1m 45s
build (3.13, yes, ubuntu-22.04-arm)	5m 2s
build (3.13, yes, windows-11-arm)	5m 6s
build (pypy3.9, no, ubuntu-latest)	4m 11s
build (3.13, yes, windows-latest)	5m 11s
build (3.13, yes, macos-13)	5m 23s
build (3.11, no, ubuntu-22.04)	4m 34s
	2h 2m 8s

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