test: Add an led test for led, neopixel, dotstar, pca9533, pca9632 configs

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

test/klippy/led.cfg

@@ -0,0 +1,44 @@
+# Test case for LED config sections
+
+[led lled]
+red_pin: PA2
+initial_RED: 0.2
+
+[neopixel nled]
+pin: PA3
+chain_count: 4
+initial_RED: 0.2
+initial_GREEN: 0.3
+initial_BLUE: 0.4
+
+[dotstar dled]
+data_pin: PA4
+clock_pin: PA5
+chain_count: 2
+initial_RED: 0.2
+initial_GREEN: 0.3
+initial_BLUE: 0.4
+
+[pca9533 p5led]
+initial_RED: 0.1
+initial_GREEN: 0.2
+initial_BLUE: 0.3
+
+[pca9632 p6led]
+scl_pin: PB1
+sda_pin: PB2
+initial_RED: 0.4
+initial_GREEN: 0.5
+initial_BLUE: 0.6
+
+[display_template dtest]
+param_myvar: 1.2
+text: { param_myvar }, { param_myvar / 2.0 }, 0.0, 2.0
+
+[mcu]
+serial: /dev/ttyACM0
+
+[printer]
+kinematics: none
+max_velocity: 300
+max_accel: 3000