Move to internal

[KCarretto]

Moves ent, graphql, auth, and namegen packages to tavern/internal to help better organize code and reduce exposed API surface.

[codecov]

Codecov Report

Merging #283 (1c597db) into main (483225e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #283   +/-   ##
=======================================
  Coverage   74.84%   74.84%           
=======================================
  Files          94       94           
  Lines        6106     6106           
=======================================
  Hits         4570     4570           
  Misses       1450     1450           
  Partials       86       86           

Files Changed	Coverage Δ
tavern/app.go	56.89% <ø> (ø)
tavern/config.go	65.68% <ø> (ø)
tavern/internal/auth/context.go	0.00% <ø> (ø)
tavern/internal/auth/middleware.go	0.00% <ø> (ø)
tavern/internal/auth/oauth.go	66.66% <ø> (ø)
tavern/internal/cdn/download.go	90.32% <ø> (ø)
tavern/internal/cdn/upload.go	70.00% <ø> (ø)
tavern/internal/ent/schema/beacon.go	72.61% <ø> (ø)
tavern/internal/ent/schema/file.go	88.33% <ø> (ø)
tavern/internal/ent/schema/mixin_history.go	100.00% <ø> (ø)
... and 15 more

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[hulto]

LGTM