Add support to get redirect_uri using par request_uri in OBIdentifierAuthenticator

[imesh94]

Add support to get redirect_uri using par request_uri in OBIdentifierAuthenticator

This change is done to support the newly introduced AuthParameterFilter in IS-6.1 (ref mail: $Filtering the query params from default consent page redirection url) which consumes session data that is required by the OBIdentifierAuth flow in CDS. Although session data is added to the request by AuthParameterFilter, redirect_uri is not added since it resides in the par request object. A new method is added to get the redirect_uri by giving the request_uri which is available as a request parameter.

Issue link: https://github.com/wso2-enterprise/ob-compliance-toolkit-cds/issues/227

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Development Checklist

1. Built complete solution with pull request in place.
2. Ran checkstyle plugin with pull request in place.
3. Ran Findbugs plugin with pull request in place.
4. Formatted code according to WSO2 code style.
5. Migration scripts written (if applicable).

Secure Development Checklist

1. Ran FindSecurityBugs plugin and verified report.
2. Ran Dependency-check plugin and verified report for new dependencies added.
3. Ran Dependency-check plugin and verified report for dependency version changes.
4. Have you verify the PR does't commit any keys, passwords, tokens, usernames, or other secrets?
5. Have you followed secure coding standards in WSO2 Secure Engineering Guidelines?

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1. Written unit tests.
2. Documented test scenarios(link available in guides).
3. Written automation tests (link available in guides).
4. Verified tests in multiple database environments (if applicable).
5. Verified tests in multiple deployed specifications (if applicable).
6. Tested with OBBI enabled (if applicable).
7. Tested with specification regulatory conformance suites (if applicable).

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Test Suite	Test Script IDs
Integration Suite	TCXXXXX, TCXXXX

Conformance Tests Details

Test Suite Name	Test Suite Version	Scenarios	Result
Security Suite	VX.X	Foo, Bar	Passed

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[imesh94]

Closing to resend since git build is not runnable