[SDK-4337] feat: Add setting to define search path for configuration files

[evansims]

Changes

This PR adds an optional configurationPath setting to the config/auth0.php SDK configuration file for applications, which allows developers to specify the search path the SDK will use to search for configuration files (.auth0..json, .env).

References

Closes #397

Testing

Test coverage remains at 100%.

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 (41ca3d6) 100.00% compared to head (5ccb001) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##                main      #407   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       496       497    +1     
===========================================
  Files             31        31           
  Lines           1271      1274    +3     
===========================================
+ Hits            1271      1274    +3     

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/Configuration.php	100.00% <100.00%> (ø)

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