Add --inpackage-suffix option

[grongor]

This allows users to choose whether they prefer mock_name.go or name_mock.go for their filenames.

Description

I've seen this issue and it seemed like an easy pick, so here we are :D

• Fixes Make it configurable if the filename addition "mock" is prefixed or postfixed #432

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

How Has This Been Tested?

Run tests, tried make mocks, and it looks ok :)

[codecov-commenter]

Codecov Report

Merging #453 (c98782f) into master (aad3571) will increase coverage by 0.12%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##           master     #453      +/-   ##
==========================================
+ Coverage   70.76%   70.89%   +0.12%     
==========================================
  Files           7        7              
  Lines        1293     1302       +9     
==========================================
+ Hits          915      923       +8     
- Misses        325      326       +1     
  Partials       53       53              

Impacted Files	Coverage Δ
cmd/mockery.go	21.73% <50.00%> (+0.24%)	⬆️
pkg/outputter.go	37.70% <100.00%> (+8.07%)	⬆️

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[LandonTClipp]

Thanks for the PR, and the great contributions in general. For this particular one, I'm not super excited to field obscure requests that don't really affect the usability or functionality of the project, as that leads to bloat. If it became a highly requested feature it'd be a different story, but I'm leaning towards a pass for now.

[grongor]

Yeah, I can understand that. I'm personally not using the --inpackage option, so I don't really care, but I must say that if I wanted to use it, I'd definitely opt-in for the suffix (so that the relevant files are "close to each other").

[YonitLopatinski]

Will this fix be merged??

[mgjules]

Can someone please merge it? or is there a blocking issue?

[LandonTClipp]

Only 10 months late, I'm deciding to approve this. Seems like enough people want this feature :) Will merge when tests pass.