Draft Palier Fixe codelist and python script

[mrgarth]

The palier_fixe_transformer.py script does the following:

• takes as input the impact data capsule exported from this Palier Fixe base: https://airtable.com/appeFlVHnX5L1XrfD/tblKmtEGKITg37GXZ/viwrhLxLdPwGYNZQN?blocks=bip4oWB81hX4XCwQB
• removes existing code list items (cids:ac Organization, SDGs, i72: units) from the file, but leaves the references to them
• corrects sff:Characteristic to cids:Characteristic
• multi-types all Theme, Outcome, Indicator, and Characteristic nodes as cids:Code, in addition to their existing type
• adds a "definedBy": cids:ac property to every node, to fulfill the cardinality requirements of the cids:Code class

Still to do:

• Further edits are still expected to the Airtable base—additional Indicators to be added, some Indicator names to be changed or edited.
• script does not yet add the other metadata that other code lists have at the head, but this is drafted in the metadata tab of the Palier Fixe google sheet where the work started: https://docs.google.com/spreadsheets/d/1u5GRVAJxKkK3Jh8bJp-pgatU9wc0AoRvTtLjGEpHvb8/edit?gid=641344245#gid=641344245
• in terms of workflow, this is a departure from our other code lists where the canonical version is TTL, and JSON serialization gets created from it. TBD how best to create the other serializations.