feat(middleware): export client and user authentication middlewares

[rashisf]

Description

resolves #256
Exported ClientAuthenticationMiddlewareProvider and UserAuthenticationMiddlewareProvider in index.ts file.

Fixes # (issue)

Type of change

• 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 not work as expected)
• Intermediate change (work in progress)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• use of Client authentication middleware in custom sequence
• use of User authentication middleware in custom sequence

Checklist:

• Performed a self-review of my own code
• npm test passes on your machine
• New tests added or existing tests modified to cover all changes
• Code conforms with the style guide
• API Documentation in code was updated
• Any dependent changes have been merged and published in downstream modules

[yeshamavani]

Can you update the readme file as well
since now user can define custom chains as well

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[rashisf]

Can you update the readme file as well since now user can define custom chains as well

Updated the docs.

[yeshamavani]

🎉 This PR is included in version 12.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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