[DXCDT-159] Fix #159 and refactor guardian resource implementation

[sergiught]

Description

Fixes: #159

The constant diffs and the apply errors we were getting were because the "phone-message-hook" provider for the phone block has no options configurable, but the auth0 and twilio ones do. To account for this and to correctly read the provider and phone.options block, the phone.options is set to a Computed property and we explicitly set them in case of "phone-message-hook" to []interface{nil}.

While fixing this we also went ahead and refactored the implementation ensuring that:

• If the phone block is present then the phone guardian is enabled, otherwise disabled.

We now also skip unnecessary API calls if the phone factor is disabled when reading.

Checklist

Note: Checklist required to be completed before a PR is considered to be reviewable.

Auth0 Code of Conduct

• I have read and agreed to the terms within the Auth0 Code of Conduct

Auth0 General Contribution Guidelines

• I have read the Auth0 General Contribution Guidelines

Changes include test coverage?

• Yes
• Not needed

Does the description provide the correct amount of context?

• Yes, the description provides enough context for the reviewer to understand what these changes accomplish

Have you updated the documentation?

• Yes, I've updated the appropriate docs
• Not needed

Is this code ready for production?

• Yes, all code changes are intentional and no debugging calls are left over

[Widcket]

Looks good, just left a comment about the test case name (and a couple of test constants).

[codecov-commenter]

Codecov Report

Merging #195 (1684cc5) into main (743180c) will increase coverage by 0.03%.
The diff coverage is 70.88%.

@@            Coverage Diff             @@
##             main     #195      +/-   ##
==========================================
+ Coverage   83.89%   83.92%   +0.03%     
==========================================
  Files          35       35              
  Lines        6059     6058       -1     
==========================================
+ Hits         5083     5084       +1     
+ Misses        773      771       -2     
  Partials      203      203              

Impacted Files	Coverage Δ
auth0/resource_auth0_guardian.go	78.69% <70.88%> (+0.52%)	⬆️

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