Berry add path.rename()

[s-hadinger]

Description:

Add ability to rename a file:

• path.rename(from:string, to:string) -> bool or nil, filename must start with '/', returns true if successful, false if not found, nil if bad arguments.

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.2.7.6
• 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