Reorganize project layout

[sergiught]

Description

Reorganizing project layout so it more closely follows today's best practices in terms of how we organize go code: https://github.com/golang-standards/project-layout.

v
  > docs
  > examples
  > internal
    > hash
    > provider
    > template
    > validation
  > scripts
  v test
    v data
      > recordings
  > vendor
  > version

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 #262 (37a32bb) into main (382f189) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #262   +/-   ##
=======================================
  Coverage   83.33%   83.33%           
=======================================
  Files          38       38           
  Lines        7127     7127           
=======================================
  Hits         5939     5939           
  Misses        941      941           
  Partials      247      247           

Impacted Files	Coverage Δ
internal/hash/hash.go	57.89% <ø> (ø)
internal/provider/data_source_auth0_client.go	78.12% <ø> (ø)
...ternal/provider/data_source_auth0_global_client.go	70.00% <ø> (ø)
internal/provider/data_source_auth0_tenant.go	89.28% <ø> (ø)
internal/provider/data_source_helpers.go	100.00% <ø> (ø)
internal/provider/resource_auth0_action.go	87.03% <ø> (ø)
...ernal/provider/resource_auth0_attack_protection.go	87.55% <ø> (ø)
internal/provider/resource_auth0_branding.go	68.75% <ø> (ø)
internal/provider/resource_auth0_client.go	94.20% <ø> (ø)
internal/provider/resource_auth0_client_grant.go	75.90% <ø> (ø)
... and 28 more

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