feat: allow creation and modification of class based calibrations

- Added router functionality for validation and standardization of class based calibration files.
- Added lib functionality for creation/modification of class based calibrations.
- Invoked lib functionality from routers to allow client creation/modification of class based calibrations.
- Introduced a new CSV file `calibration_classes.csv` containing variant URNs and their corresponding class names.
- Implemented tests for creating and updating score calibrations using class-based classifications.
- Enhanced existing test suite with parameterized tests to validate score calibration creation and modification.
- Ensured that the response includes correct functional classifications and variant counts.

Author: bencap

tests/routers/data/calibration_classes.csv

@@ -0,0 +1,4 @@
+variant_urn,class_name
+urn:mavedb:00000001-a-1#1,normal_class
+urn:mavedb:00000001-a-1#2,abnormal_class
+urn:mavedb:00000001-a-1#3,not_specified_class