[Feature] update api

[xu-hao]

What problem(s) do you aim to solve?

New way for handling plugin “default” mapper, fhir server: Currently, plugin self-identifies as default for the whole app: [Config... plugin type enum:[ g, m, f, fD, mD ] ]

Currently, plugin self-identifies as default for the whole app:

What feature solves it and why?

[Config... plugin type enum:[ g, m, f] ] default_FHIR_piid << should be on the list of mapper dependencies Default_mapper_piid

What implementation(s) do you suggest?

• [ ] Add /systemDefaults 200 { fhir_piid, mapper_piid } 500: { defaults:{} Message [] Add factory defaults here: https://github.com/RENCI/pds-release/blob/master/test.system/env.pds PDSPI_CONFIG_DEFAULT_CONFIG
• [ ] add /systemDefaults in https://github.com/RENCI/pdspi-config
• [ ] Update cdm
• [ ] Update config
• [ ] Update dashboard

Anything else? Leave blank, as needed