DXCDT-155: Fix subsequent updates to partial refresh_token object

[willvedd]

Description

As noted in #24, there is an issue when applying client configurations when not all properties of a refresh token are set. The initial config is applied appropriately, but subsequent applies are met with this general error:

 refresh_token {
          - idle_token_lifetime          = 1296000 -> null
          - infinite_idle_token_lifetime = true -> null
          - infinite_token_lifetime      = true -> null
          - token_lifetime               = 2592000 -> null
            # (3 unchanged attributes hidden)
        }
        # (1 unchanged block hidden)
        
Error: 400 Bad Request: Neither infinite_token_lifetime nor infinite_idle_token_lifetime can be true when token expiration type is 'non-expiring'

What's occurring is that several of these properties within a client's refresh_token object are set to defaults if not explicitly declared. By setting Computed: true to each of these properties, we signal to the provider that the default values should be used instead of remaining empty.

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

[codecov-commenter]

Codecov Report

Merging #187 (ecf3839) into main (a924b78) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
+ Coverage   84.01%   84.02%   +0.01%     
==========================================
  Files          35       35              
  Lines        6024     6029       +5     
==========================================
+ Hits         5061     5066       +5     
  Misses        762      762              
  Partials      201      201              

Impacted Files	Coverage Δ
auth0/resource_auth0_client.go	94.20% <100.00%> (+0.03%)	⬆️

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[sergiught]

Great work fixing this 💪🏻