fix json loads numpy

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/12071834

* fix jsonplus

* add unittest

* fix json dump np float

modelscope/fileio/format/jsonplus.py

@@ -378,6 +378,8 @@ _decode_handlers = {
     'tuple': tuple,
     'set': set,
     'ndarray': np.asarray,
+    'float16': np.float16,
+    'float32': np.float32,
     'frozenset': frozenset,
     'complex': kwargified(complex),
     'Decimal': Decimal,