Sgp40 (#1513)

* Start of SGP40 dev

* Clean up

* Initial Commit

* VOC is working

* Fixed up sensor config

* Lint Fixes
Added in save/restore baseline
Noted original repo in header

* Lint Fixes
Added to test

* Lint Fixes

* Added additional check on restoring

* Removed double check

* Changed defines to static const double

* Changed defines to const
Do not send voc index until sensor stabilizes

* Fixed sensor stabilization message

* Fixup according to PR

* samples_read increment fix

* Fixed missing device class

* Choose a SENSOR device class

* Moved some sensors for tests

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>

tests/test2.yaml

@@ -54,6 +54,10 @@ deep_sleep:
 as3935_i2c:
   irq_pin: GPIO12
 
+mcp3008:
+  - id: 'mcp3008_hub'
+    cs_pin: GPIO12
+
 sensor:
   - platform: homeassistant
     entity_id: sensor.hello_world
@@ -212,12 +216,21 @@ sensor:
   - platform: inkbird_ibsth1_mini
     mac_address: 38:81:D7:0A:9C:11
     temperature:
-        name: 'Inkbird IBS-TH1 Temperature'
+      name: 'Inkbird IBS-TH1 Temperature'
     humidity:
-        name: 'Inkbird IBS-TH1 Humidity'
+      name: 'Inkbird IBS-TH1 Humidity'
     battery_level:
-        name: 'Inkbird IBS-TH1 Battery Level'
-
+      name: 'Inkbird IBS-TH1 Battery Level'
+  - platform: sgp40
+    name: 'Workshop VOC'
+    update_interval: 5s
+    store_baseline: 'true'
+  - platform: mcp3008
+    update_interval: 5s
+    mcp3008_id: 'mcp3008_hub'
+    id: freezer_temp_source
+    reference_voltage: 3.19
+    number: 0
 time:
   - platform: homeassistant
     on_time: