Move modules/indexer to modules/indexer/code

[lunny]

As title.

[codecov-io]

Codecov Report

Merging #9301 into master will increase coverage by 0.01%.
The diff coverage is 60%.

@@            Coverage Diff            @@
##           master   #9301      +/-   ##
=========================================
+ Coverage   41.19%   41.2%   +0.01%     
=========================================
  Files         559     559              
  Lines       73115   73115              
=========================================
+ Hits        30120   30129       +9     
+ Misses      39218   39205      -13     
- Partials     3777    3781       +4

Impacted Files	Coverage Δ
modules/indexer/code/indexer.go	55.26% <ø> (ø)
modules/indexer/code/repo.go	68.91% <100%> (ø)
modules/search/search.go	79.51% <100%> (ø)	⬆️
modules/indexer/code/bleve.go	48.4% <45.45%> (ø)	⬆️
modules/migrations/migrate.go	23.78% <0%> (-1.63%)	⬇️
modules/migrations/gitea.go	8.82% <0%> (-0.64%)	⬇️
models/repo.go	47.88% <0%> (-0.06%)	⬇️
models/error.go	34.5% <0%> (+1.17%)	⬆️
modules/process/manager.go	78.31% <0%> (+3.61%)	⬆️
modules/task/migrate.go	28.94% <0%> (+3.94%)	⬆️
... and 1 more

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