v1.9.0

Important BUG FIX

• Fix a bug introduced in v1.6.0 that could result in corrupted store "state" file if all
  the "outputs" were already cached for a module in a given segment (rare occurence)
• We recommend clearing your substreams cache after this upgrade and re-processing or
  validating your data if you use stores.

Fixed

• substreams 'tools decode state' now correctly prints the kvops when pointing to store output files

Added

• Expose a new intrinsic to modules: skip_empty_output, which causes the module output to be skipped if it has zero bytes. (Watch out, a protobuf object with all its default values will have zero bytes)
• Improve schedule order (faster time to first block) for substreams with multiple stages when starting mid-chain