CLI-ify rgblight_breathing_table_calc.c (#11174)

Co-authored-by: Takeshi ISHII <2170248+mtei@users.noreply.github.com>
Co-authored-by: Zach White <skullydazed@drpepper.org>

lib/python/qmk/tests/test_cli_commands.py

@@ -190,3 +190,10 @@ def test_clean():
     result = check_subcommand('clean', '-a')
     check_returncode(result)
     assert result.stdout.count('done') == 2
+
+
+def test_generate_rgb_breathe_table():
+    result = check_subcommand("generate-rgb-breathe-table", "-c", "1.2", "-m", "127")
+    check_returncode(result)
+    assert 'Breathing center: 1.2' in result.stdout
+    assert 'Breathing max:    127' in result.stdout