#52 CQuery: optimize non iterable

Optimize operations like collect, fold etc which do not have to create iterators, stream etc

Review every terminal operations and some intermediate:

• collect
  • collect
  • array
  • list
  • set
  • join
  • into
• fetch
  • fetch
  • prefetch
  • cache
• group
• size
  • isEmpty
• fold
  • min
  • max
• single
  • first
  • last
• at
• distinct
  • sort
  • reverse
• each
  • onEach
• matchAny
  • matchAll
  • matchNone

optimized

TODO: test everything. Some #wileEach does not work correctly.