Add support for get style definition

[cnmlgbgithub]

PR Details

Create a new GetStyle function to get style definitions

Description

Support to get the fills, theme color, font family, font size, alignment, cell protections, build-in, and custom number formats, implement this feature in the styles.go source code

Related Issue

#314, #1520 and #1521

Motivation and Context

How Has This Been Tested

All existing unit tests passed and new unit test cases passed.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[xuri]

LGTM. We need to implement extractNumFmt, extractAlignment and extractProtection in this change list.

[xuri]

Good job. I've left some comments.

[xuri]

LGTM, thanks for your contribution.