Omero-metadata

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* Deprecate `--report` option in `omero metadata populate` subcommand in favor or `-v/-q`
* Use GitHub actions

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* Drop support for Python 2

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* Expand README to describe the usage of the populate command
* Remove Well/Plate warnings when populating a Project/Dataset

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* Rename imports to omero_metadata.{cli,populate}
* Handle change in table closing semantics

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* Allow to filter CSV annotation file and populate only a Dataset or a Plate

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* Drop support for Python 2.6
* Unify naming of the Image column in OMERO.tables
* Fix CLI metadata populate --context deletemap --dry-run behavior
* Propagate delete options in DeleteMapAnnotationContext
* Added bulk annotations for Projects and Datasets
* Changed csv parsing to proceed line-by-line (streaming)