Create recursive option for packages config

[LandonTClipp]

Description

This commit allows you to specify recursive: true for the packages
config feature. This will recursively search for all packages on-disk
so that you don't have to manually specify them in the mockery config.

• Fixes Implement recursive option for packages feature #594

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Version of Golang used when building/testing:

• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Patch coverage: 62.82895% and project coverage change: -1.36362 ⚠️

Comparison is base (7dad3a3) 75.69742% compared to head (5959e21) 74.33380%.

❗ Current head 5959e21 differs from pull request most recent head 8a6a6bb. Consider uploading reports for the commit 8a6a6bb to get more accurate results

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master        #595         +/-   ##
===================================================
- Coverage   75.69742%   74.33380%   -1.36362%     
===================================================
  Files              7           7                 
  Lines           1864        2139        +275     
===================================================
+ Hits            1411        1590        +179     
- Misses           362         421         +59     
- Partials          91         128         +37     

Impacted Files	Coverage Δ
cmd/mockery.go	62.98507% <0.00000%> (-0.56916%)	⬇️
cmd/showconfig.go	46.87500% <42.85714%> (+17.70833%)	⬆️
pkg/config/config.go	68.91616% <64.77273%> (-5.76195%)	⬇️
pkg/generator.go	92.93194% <100.00000%> (+0.07479%)	⬆️

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