feat(ui-plugin) - Allow custom userContext states to be added

[mkamalas]

Background:

In our fork, we have some custom states that we want to store in userContext. So, this PR allows for a custom object to be plugged in to the state and avoids merge conflicts in the userContext main file.

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[rtekal]

@jjoyce0510 This PR is general purpose and can help community to store and use the custom context.

[jjoyce0510]

This looks solid to me.

Thanks!

[jjoyce0510]

Looks lke CI is failing. Try yarn prettier --write src to address.

Cheers
John

[mkamalas]

Linting errors have been fixed. Please check.

Thanks

[mkamalas]

Linting errors have been fixed. Please check.

Thanks

@jjoyce0510 - Could you please advise if anything else needs to be addressed ?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
...ub-web-react/src/app/context/CustomUserContext.tsx	100.00% <100.00%> (ø)
datahub-web-react/src/app/context/userContext.tsx	100.00% <100.00%> (ø)

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