Change input datasets to just openfast and inflow

Contents (#10)

IMPORTANT: There is 1 breaking change.

Enhancements

• 💥 BREAKING CHANGE: Change accepted input manifest datasets to just "openfast" and "inflow"

Dependencies

• Add gcp-storage-emulator dev dependency and use it for local testing
• Use octue==0.55.0

Testing

• Move main openfast file to top of directory tree

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Upgrade instructions

💥 Change accepted input manifest datasets

Include all openfast files in the openfast dataset apart from inflow related files which should still be given in a separate inflow dataset.