Add support for `textFormat.foregroundColorStyle`

[Ionut Prunache]

get_default_format on 0.0.7 fails because it cannot parse default format props for a Sheet.

  File "/usr/local/lib/python3.8/site-packages/gspread_formatting/__init__.py", line 41, in get_default_format
    return CellFormat.from_props(fmt) if fmt else None
  File "/usr/local/lib/python3.8/site-packages/gspread_formatting/__init__.py", line 220, in from_props
    return _props_to_component(_underlower(cls.__name__), props)
  File "/usr/local/lib/python3.8/site-packages/gspread_formatting/__init__.py", line 185, in _props_to_component
    v = _props_to_component(item_alias, v, True)
  File "/usr/local/lib/python3.8/site-packages/gspread_formatting/__init__.py", line 185, in _props_to_component
    v = _props_to_component(item_alias, v, True)
  File "/usr/local/lib/python3.8/site-packages/gspread_formatting/__init__.py", line 176, in _props_to_component
    raise ValueError("No format component named '%s'" % class_alias)
ValueError: No format component named 'foregroundColorStyle'

This seems to be caused by a recent change in the Google Sheets API, see the multiple mentions of foregroundColorStyle and backgroundColorStyle in the documentation:
https://developers.google.com/resources/api-libraries/documentation/sheets/v4/python/latest/sheets_v4.spreadsheets.html

[Robin Thomas]

Thanks for the bug report and the links to API documentation. I'm readying a new release that supports these two new CellFormat fields (and the accompanying ColorStyle).

[Robin Thomas]

Some complications:

1. I can successfully set via live API the backgroundColorStyle via userEnteredFormat. But when I read back the userEnteredFormat for the cell, backgroundColorStyle is absent. It is present in effectiveFormat, however.

2. The REST API documentation does not yet mention either backgroundColorStyle or foregroundColorStyle: https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets/cells#CellFormat . These two fields are mentioned in the C# and Python library documentation, but not the REST API. I wonder what's going on here.

Nonetheless, I'm adding support for these new fields and objects since they're backwards compatible.

[Robin Thomas]

@iprunache Release is up on PyPI:

https://pypi.org/project/gspread-formatting/0.0.8/

[Ionut Prunache]

Thanks @robin900 for the quick fix!

The API change is indeed very stealthy. Perhaps we'll get an update on the REST API soon. It doesn't help that there aren't any easily available release notes for the sheets API.

[Robin Thomas]

@iprunache please let me know that release 0.0.8 works for you...

[Ionut Prunache]

@robin900 I no longer have any issues on my use case with 0.0.8. Thanks again for the fix!