Support BYOK in Terraform provider

[acwest]

This PR brings support of the Bring Your Own Key (BYOK) functionality in the Auth0 Management API.

🔧 Changes

A new block customer_provided_root_key has been added to the auth0_encryption_key_manager resource.
When this block is added, this initiates the process of adding a customer provided root key to the tenant. The block will at this point be filled with attributes from the Auth0 tenant key_id, type, state, created_at, and updated_at which describe the new key, as well as public_wrapping_key and wrapping_algorithm, which will be used by the customer to wrap the new key they generate in their KSM/HSM.
Once the key is generated and wrapped, the Base64 encoded key is supplied by the customer in the wrapped_key attribute.
If the customer_provided_root_key block is removed, the key provisioning is stopped and Auth0 reverts to using a root key generated internally.

📚 References

Customer Managed Keys

API Docuimentation

• Get all encryption keys
• Create the new encryption key
• Rekey the key hierarchy
• Get the encryption key by its key id
• Delete the encryption key by its key id
• Import the encryption key
• Create the public wrapping key

🔬 Testing

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 84.10042% with 38 lines in your changes missing coverage. Please review.

Project coverage is 90.19%. Comparing base (1a3b628) to head (d77ad15).

Files with missing lines	Patch %	Lines
internal/auth0/encryptionkeymanager/resource.go	79.12%	26 Missing and 12 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1041      +/-   ##
==========================================
- Coverage   90.27%   90.19%   -0.09%     
==========================================
  Files         114      115       +1     
  Lines       16448    16666     +218     
==========================================
+ Hits        14849    15032     +183     
- Misses       1122     1146      +24     
- Partials      477      488      +11     

Files with missing lines	Coverage Δ
internal/auth0/encryptionkeymanager/flatten.go	100.00% <100.00%> (ø)
internal/wait/wait.go	100.00% <100.00%> (ø)
internal/auth0/encryptionkeymanager/resource.go	83.92% <79.12%> (-8.85%)	⬇️