Berry debug.gcdebug() to enable GC debugging

[s-hadinger]

Description:

To ease debugging of the Garbage Collector, a new function debug.gcdebug([bool])-> bool allows to force an automatic GC after each memory allocation or reallocation.

import debug

# set gc debugging
debug.gcdebug(true)

# disable gc debugging
debug.gcdebug(false)

# query state
print(debug.gcdebug())

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.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.2.0.14
• I accept the CLA.

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