Add support for DPoP

[laura-rodriguez]

• Add a DPoPProofJwtGenerator class responsbile for DPoP Proof JWT generation
• Update OAuthTokenProvider interface and default classes to return an OAuthTokenResponse instead of just the access token
• Extend the OAuthTokenResponse with OAuthApiResponse properties. This way, we can parse OAuth errors that come with a different format in comparison with Okta resource APIs
• Update the OktaPagedCollectionEnumerator so the DPoP header is added in paginated results when DPoP is enabled
• Update the ApiClient.ExecuteWithRetryHeaders to generate a new DPoP JWT when it's applicable
• Update templates with the proposed DPoP solution and regenerate the SDK to make sure everything is in place
• Add integration tests to cover DPoP scenarios
• Add unit tests to cover DPoP scenarios
• Update readme with a note about DPoP support
• This feature will be released in version 8.0.0 since it has several breaking changes to make the code clearer

Note for reviewers: If you want to review the feature right before the templates were modified to reduce the number of files to review, refer to the following commit

[duytiennguyen-okta]

I have a question because I have to do this for golang: How do you update caching for the access token?

[laura-rodriguez]

@bryanapellanes-okta I've updated my PR based on today's discussion. Feel free to review it at your convenience and resolve open comments if applicable. Thank you for the feedback!