feature: Add management() to SDK service as a Management API convenience method

[evansims]

Changes

This PR adds a management() convenience method to the SDK's Laravel service container. It saves writing a small amount of redundant boilerplate in order to access the Management API classes from the underlying PHP SDK.

Before this change:

<?php

app('auth0')
  ->getSdk()
  ->management()
  ->...

After this change:

<?php

app('auth0')
  ->management()
  ->...

Admittedly a minuscule change, but it better illustrates that the Management API is an integral part of the SDK, and is easily accessible to the host application.

References

Jira: SDK-4149

Testing

Tests have been added to cover the new method.

Contributor Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 code of conduct

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (ae4b1f7) 100.00% compared to head (22499e2) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##                main      #376   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       288       288           
===========================================
  Files             21        21           
  Lines            784       784           
===========================================
  Hits             784       784           

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Auth0.php	100.00% <100.00%> (ø)

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