Chore: remove coreapi/coreschema import from compat.py

Author: TGoddessana

rest_framework/compat.py

@@ -23,32 +23,20 @@ def unicode_http_header(value):
     postgres_fields = None
 
 
-# coreapi is required for CoreAPI schema generation
-try:
-    import coreapi
-except ImportError:
-    coreapi = None
-
-# uritemplate is required for OpenAPI and CoreAPI schema generation
+# uritemplate is required for OpenAPI schema generation
 try:
     import uritemplate
 except ImportError:
     uritemplate = None
 
 
-# coreschema is optional
-try:
-    import coreschema
-except ImportError:
-    coreschema = None
-
-
 # pyyaml is optional
 try:
     import yaml
 except ImportError:
     yaml = None
 
+
 # inflection is optional
 try:
     import inflection