feat: Add Linkedin get_articles

[Wendong-Fan]

Description

Add Linkedin get_articles can get articles when user id provided

Motivation and Context

close #999

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Example (update in the folder of example)

Implemented Tasks

• Subtask 1
• Subtask 2
• Subtask 3

Checklist

Go over all the following points, and put an x in all the boxes that apply.
If you are unsure about any of these, don't hesitate to ask. We are here to help!

• I have read the CONTRIBUTION guide. (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly. (required for a bug fix or a new feature)
• I have updated the documentation accordingly.

[NeilJohnson0930]

Awesome! More importantly, how can we obtain a LinkedIn access token with sufficient permissions? If it's convenient, could you also add a documentation for that?

[Wendong-Fan]

Awesome! More importantly, how can we obtain a LinkedIn access token with sufficient permissions? If it's convenient, could you also add a documentation for that?

Thanks @NeilJohnson0930 , will add this

[Asher-hss]

It seems there might be an issue with the test part; perhaps we should modify the parameters of the lambda
@Wendong-Fan

monkeypatch.setattr(
        linkedin_toolkit, 'get_profile', lambda self, include_id: mock_profile
    )