Add include_email_in_redirect field to email template resource

[willvedd]

Description

Adding the include_email_in_redirect field for email template resources. Request for this came in via #34. This work necessitates a correlating Go SDK addition.

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 #229 (cc14e96) into main (7b53f6d) will increase coverage by 0.01%.
The diff coverage is 94.73%.

@@            Coverage Diff             @@
##             main     #229      +/-   ##
==========================================
+ Coverage   83.63%   83.65%   +0.01%     
==========================================
  Files          36       36              
  Lines        6587     6595       +8     
==========================================
+ Hits         5509     5517       +8     
  Misses        859      859              
  Partials      219      219              

Impacted Files	Coverage Δ
auth0/resource_auth0_email_template.go	79.72% <94.73%> (+1.20%)	⬆️

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