Unify API returns to sql composite types, add pattern tests for REST API

Requires haf!634 (merged)

Related with balance_tracker!171 (merged)

• Unifies API responses - adds exception handling instead of null values in composite types
• every api returns sql type instead of json
• fix for /global-state values were shortened by json
• adds patten tests for REST API

tests/tavern/get_acc_op_types/blocktrades.pat.json

+[
+  0,
+  1,
+  2,
+  3,
+  4,
+  5,
+  6,
+  7,
+  10,
+  11,
+  12,
+  13,
+  14,
+  15,
+  18,
+  20,
+  51,
+  52,
+  53,
+  55,
+  56,
+  57,
+  61,
+  64,
+  72,
+  77,
+  78,
+  79,
+  80,
+  85,
+  86
+]
\ No newline at end of file