[OB3] Role extraction improvement - add support to extract both PSD2 and PSP roles from the certificate as needed

[Akila94]

[OB3] Role extraction improvement - add support to extract both PSD2 and PSP roles from the certificate as needed

• This PR adds a new getter and a setter to set/get roles and PSD2 roles (AISP, PISP, etc) in formats from the CertificateContent class. The relevant variable is initialized when extracting the certificate content from the extract() method of the CertificateContentExtractor class.
• The DCRTPPValidationExecutor is changed to get the PSD2 roles for doing its validation. The reason for this is the UK SSA comes with the PSD2 role formats such as AISP, PISP, etc. This class will later be moved to the UK toolkit. Hence this class is marked as deprecated.
• The APITPPValidationExecutor is changed to get the PSP roles for doing its validation. The reason for this is that the role validation needs to be done using the roles defined in the certificate as it is.
• The unit tests are changed according to the above changes.

Related Issue link:
#163

Doc Issue: N/A

Applicable Labels: OB2

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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. Ran FindSecurityBugs plugin and verified report.
5. Formatted code according to WSO2 code style.
6. Have you verify the PR does't commit any keys, passwords, tokens, usernames, or other secrets?
7. Migration scripts written (if applicable).
8. Have you followed secure coding standards in WSO2 Secure Engineering Guidelines?

Testing Checklist

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).

Automation Test Details

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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