Berry add string.startswith, string.endswith and %q format

[s-hadinger]

Description:

Sync with upstream Berry:

• Add string.startswith and string.endswith berry-lang/berry#406:
  • string.startswith(hay:string, needle:string [, case_insensitive:bool]) -> bool
  • string.endswith(hay:string, needle:string [, case_insensitive:bool]) -> bool
  • These new methods are lightweight, allow for case sensitive or case insensitive matches, and don't need to allocate any temporary object.
• added q format berry-lang/berry#382:
  • add support for %q format
  • print(string.format("%q","\ntest")) --> '\ntest'

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

[Noschvie]

Please fix the typo in the title too, thanks.

[s-hadinger]

Done, thanks