Finalize storage for ORU

• Refactor the codebase: @alocascio MR !58
  • renaming lib_new_storage and every reference of it to a new name.
  • Remove the file fixed_size.ml/test_fixed_size.ml, etc.
  • Only use stream through the Produce/Consume modules.
• Add mlis
• Remove Stream prefix
• Error handling
• Add tests (unit tests, reach 100 % coverage, automatic testing, etc.) @alocascio

The current tests that are in the code are only regression tests: tests were added when there was a bug while implementing. Bisect is already a part of the dune config.

• Update to the new environment V4
• Benchmarking the library @lykimquyen and @alocascio
• Documentation of the interface
• Specification of the library @lykimquyen issue 1660
• Library documentation (README)
• Clean up @corneliuhoffman

Optimization:

• Add extenders node @corneliuhoffman