Dcicutils

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* Add new schema_utils module for schema parsing

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* Minor fix to misc_utils.to_integer to handle float strings.
* Minor fix to structured_data to accumulate unique resolved_refs across schemas.
* Added ability to autoadd properties structured_data.StructuredDataSet;
to automatically pass in submission_centers on submission, and
not require that the user explicitly set this in the spreadsheet.
* Changes to structured_data to respect uniqueItems for arrays.
* Handle no schemas better in structured_data.
* Added portal_utils.Portal.ping().
* Minor fix in portal_utils.Portal._uri().

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* Moved structured_data.py from smaht-portal to here; new portal_utils and data_readers modules.
* Strip sheet name in data_readers.Excel; respecte (ignore) hidden sheets.

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* More work related to SMaHT ingestion (bundle/sheet_utils, data_readers, etc).

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* Updates for RAS to Redis API

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* 2023-11-02
* Added ``SchemaManager.get_identifying_properties`` in ``bundle_utils``
which implicitly adds ``identifier`` to ``identifyingProperties``.
* Added support for ``portal_vapp`` to to `ff_utils.get_metadata``.