Berry 'light.get()' direct access to values

[s-hadinger]

Description:

Berry light.get() direct access to values. You can now pass a second string argument to get a specific value and avoid the creation of a map instance

# using map as before
light.get()['bri']

# direct access
light.get(0, 'bri')

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.8
• The code change is tested and works with Tasmota core ESP32 V.3.1.4
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass