add key collector component (#4242)

Co-authored-by: Samuel Sieb <samuel@sieb.net>

tests/test5.yaml

@@ -168,14 +168,22 @@ binary_sensor:
       sn74hc165: sn74hc165_hub
       number: 0
 
-
-
   - platform: ezo_pmp
     pump_state:
       name: "Pump State"
     is_paused:
       name: "Is Paused"
 
+  - platform: matrix_keypad
+    keypad_id: keypad
+    id: key4
+    row: 1
+    col: 1
+  - platform: matrix_keypad
+    id: key1
+    key: 1
+
+
 tlc5947:
   data_pin: GPIO12
   clock_pin: GPIO14
@@ -558,3 +566,21 @@ sn74hc165:
   load_pin: GPIO27
   clock_inhibit_pin: GPIO26
   sr_count: 4
+
+
+matrix_keypad:
+  id: keypad
+  rows:
+    - pin: 21
+    - pin: 19
+  columns:
+    - pin: 17
+    - pin: 16
+  keys: "1234"
+
+key_collector:
+  - id: reader
+    source_id: keypad
+    min_length: 4
+    max_length: 4
+