Adds support for managing DPoP configuration

[kailash-b]

Changes

This PR adds support for the DPoP (Demonstrating Proof-of-Possession) mechanism to the Resource Server proof-of-possession configuration.

Summary of changes:
The Mechanism enum now supports the DPoP value, which can be used when configuring proof-of-possession settings for resource servers:

var resourceServer = new ResourceServerUpdateRequest
{
    ProofOfPossession = new ProofOfPossession()
    {
        Mechanism = Mechanism.DPoP,
        Required = true
    }
};

References

• Related to ticket: SDK-6814

Testing

This change has been tested with the following:

• This change adds unit test coverage
• This change adds integration test coverage
• This change has been tested on the latest version of the platform/language

Checklist

• I have read the Auth0 general contribution guidelines

• I have read the Auth0 Code of Conduct

• All existing and new tests complete without errors

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.20%. Comparing base (a3dab88) to head (2def0a3).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #891   +/-   ##
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  Coverage   79.20%   79.20%           
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  Files         457      457           
  Lines        5915     5915           
  Branches      277      277           
=======================================
  Hits         4685     4685           
  Misses       1136     1136           
  Partials       94       94           

Flag	Coverage Δ
authIntTests	30.60% <ø> (ø)
mgmtIntTests	60.79% <ø> (ø)
unittests	8.96% <ø> (ø)

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