Add Clue Mock Generator tool under mock

[douglaswth]

This adds the Clue Mock Generator tool (cmg) that generates dependency mocks using the goa.design/clue/mock package from the exported interfaces in a given package so they do not need to be written by hand.

[codecov-commenter]

Codecov Report

Merging #192 (f138da6) into main (7bfddc7) will increase coverage by 1.68%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main     #192      +/-   ##
==========================================
+ Coverage   92.62%   94.31%   +1.68%     
==========================================
  Files          33       43      +10     
  Lines        1682     2182     +500     
==========================================
+ Hits         1558     2058     +500     
  Misses         91       91              
  Partials       33       33              

Flag	Coverage Δ
micro	94.31% <100.00%> (+1.68%)	⬆️

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Impacted Files	Coverage Δ
mock/cmd/cmg/pkg/generate/import.go	100.00% <100.00%> (ø)
mock/cmd/cmg/pkg/generate/interface.go	100.00% <100.00%> (ø)
mock/cmd/cmg/pkg/generate/method.go	100.00% <100.00%> (ø)
mock/cmd/cmg/pkg/generate/mocks.go	100.00% <100.00%> (ø)
mock/cmd/cmg/pkg/generate/type.go	100.00% <100.00%> (ø)
mock/cmd/cmg/pkg/parse/interface.go	100.00% <100.00%> (ø)
mock/cmd/cmg/pkg/parse/method.go	100.00% <100.00%> (ø)
mock/cmd/cmg/pkg/parse/package.go	100.00% <100.00%> (ø)
mock/cmd/cmg/pkg/parse/type.go	100.00% <100.00%> (ø)
mock/cmd/cmg/pkg/parse/value.go	100.00% <100.00%> (ø)

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