Add ability for mockery to search up to root path for config file

[LandonTClipp]

Description

This adds the ability for mockery to iteratively search for a config file starting from the current working directory up to the root path. This is useful in cases where you use go generate and you don't want to re-specify command-line arguments multiple times.

Also added log line to indicate what config file was chosen:

20 Dec 22 15:10 CST INF Using config: /home/lclipp/git/vektra/mockery/.mockery.yaml dry-run=false version=v0.0.0-dev

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

How Has This Been Tested?

go test ./...

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-commenter]

Codecov Report

Base: 71.66% // Head: 72.06% // Increases project coverage by +0.40% 🎉

Coverage data is based on head (231d3d6) compared to base (847d988).
Patch coverage: 65.71% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #527      +/-   ##
==========================================
+ Coverage   71.66%   72.06%   +0.40%     
==========================================
  Files           6        6              
  Lines        1214     1235      +21     
==========================================
+ Hits          870      890      +20     
  Misses        301      301              
- Partials       43       44       +1     

Impacted Files	Coverage Δ
cmd/showconfig.go	29.16% <0.00%> (-9.73%)	⬇️
cmd/mockery.go	28.39% <79.31%> (+6.90%)	⬆️

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