chore(internal): move packages to internal directory

[qdm12]

Changes

💁‍♂️ This PR is designed to be nice with other PRs, and keep history of file movements for easy rebase/merge on development once it gets merged.

💁 95% of deltas are import strings updated to have the internal/ part. File movements are not part of them. There are a few extra changes in logic to find the chains directory in tests in internal/lib/utils/utils.go

• Rename *.out files to *.json to avoid gitignore conflicts
• Do not .gitignore test_data paths
• Move lib, dot, tests and chain to internal directory
• Adapt import paths by adding /internal suffix to dot, lib, chain and tests import paths
• Improve logic to find the chain directory in internal/lib/utils/utils.go
• Rebase interactively to have a 3-commits only PR
  • Squash gitignore changes in a single commit
  • Squash file movements in a single commit
  • Squash import paths renamings in a single commit
• MERGE (:warning:) the PR in development, not squash and merge so file movements are tracked and people can easily rebase their branches on development with git rebase development.

Tests

Issues

• Implement Go Standard Package folder structure #1527

Primary Reviewer

• @timwu20

[codecov]

Codecov Report

Merging #2139 (1e31ef7) into development (8fd1511) will increase coverage by 0.03%.
The diff coverage is 81.81%.

@@               Coverage Diff               @@
##           development    #2139      +/-   ##
===============================================
+ Coverage        61.49%   61.52%   +0.03%     
===============================================
  Files              213      213              
  Lines            27429    27446      +17     
===============================================
+ Hits             16867    16887      +20     
+ Misses            8692     8689       -3     
  Partials          1870     1870              

Flag	Coverage Δ
unit-tests	61.52% <81.81%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/gossamer/account.go	45.78% <ø> (ø)
cmd/gossamer/config.go	75.19% <ø> (ø)
cmd/gossamer/export.go	88.46% <ø> (ø)
cmd/gossamer/flags.go	66.66% <ø> (ø)
cmd/gossamer/import_runtime.go	40.00% <ø> (ø)
cmd/gossamer/main.go	14.28% <ø> (ø)
cmd/gossamer/toml_config.go	27.27% <ø> (ø)
cmd/gossamer/utils.go	74.35% <ø> (ø)
internal/dot/config.go	26.19% <ø> (ø)
internal/dot/core/messages.go	63.07% <ø> (ø)
... and 230 more

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[qdm12]

Defunct new-year PR, some key takeaways are in #2292