fix(attr_spec): modify spec to fit the latest pydantic model

Author: ltroussellier

attr_specs.yaml

@@ -1,82 +1,82 @@
 - source_collection: activity_id
-  value_type: string_array
+  attr_field_value_type: string_array
   is_required: true
 - source_collection: creation_date
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: contact
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: conventions
-  field_name: Conventions
-  value_type: string_array
+  attr_field_name: Conventions
+  attr_field_value_type: string_array
   is_required: true
 - source_collection: dataset_contributor
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: data_specs_version
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: frequency
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: grid_label
-  field_name: grid
+  attr_field_name: grid
   specific_key: description
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: grid_label
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: institution_id
   specific_key: description
-  field_name: institution
-  value_type: string
+  attr_field_name: institution
+  attr_field_value_type: string
   is_required: true
 - source_collection: institution_id
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: license
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: nominal_resolution
   specific_key: description
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: processing_code_location
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: product
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: realm
-  value_type: string_array
+  attr_field_value_type: string_array
   is_required: true
 - source_collection: references
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: region
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: source_id
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: source_id
   specific_key: label_extended
-  field_name: source
-  value_type: string
+  attr_field_name: source
+  attr_field_value_type: string
   is_required: true
 - source_collection: source_id
   specific_key: drs_name
-  field_name: source_label
-  value_type: string
+  attr_field_name: source_label
+  attr_field_value_type: string
   is_required: true
 - source_collection: tracking_id
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: variable_id
-  value_type: string
+  attr_field_value_type: string
   is_required: true
 - source_collection: variant_label
-  value_type: string
+  attr_field_value_type: string
   is_required: true