Add option to validate endpoint for ensure-latest-cedar-version

[shirey]

Based on the description below of how to verify the latest version of a CEDAR template using the CEDAR API add an optional query parameter to the POST /metadata/validate, ensure-latest-cedar-version=true which, when included will extract the metadata_schema_id field from the uploaded metadata file and call the CEDAR ../versions endpoint to verify that it is the latest version of the schema (as specified in above ingest-ui #1487). If not the latest version return a 400 response with the message "This is not the latest version of the metadata specification as defined in CEDAR"

This new option will be used in ingest-ui #1487.

To ascertain if a CEDAR template is the latest version of the template call https://resource.metadatacenter.org/templates/<url encoded template id>/versions where the <url encoded template id> is constructed from value in the .tsv file in column metadata_schema_id and the url https://repo.metadatacenter.org/templates/<template id>. (api_key needed see below for curl example). Parse the output to make sure that the entry with is_latest_version == true` has the same template id as the one that is in the uploaded tsv.

curl -X GET --header 'Accept: application/json' --header 'Authorization: apiKey <api key>' 'https://resource.metadatacenter.org/templates/https%3A%2F%2Frepo.metadatacenter.org%2Ftemplates%2F<template id>/versions'

Where

• is the HuBMAP API Key for the CEDAR API
• is the template id (metadata_schema_id) from the .tsv file