Allow multiple schemas to be exposed in one instance (#1450)

The schema to use can be selected through the headers `Accept-Profile` for GET/HEAD and `Content-Profile` for POST/PATCH/PUT/DELETE.

This is based on the https://www.w3.org/TR/dx-prof-conneg/ttps://www.w3.org/TR/dx-prof-conneg/ spec.

Also increase all memory tests by 1M(otherwise CI fails).

Co-authored-by: Mahmoud Kassem <MKassem@gk-software.com>
Co-authored-by: Mahmoud Kassem <mahmoud_k@mail.com>

test/Feature/QuerySpec.hs

@@ -10,7 +10,7 @@ import Test.Hspec.Wai.JSON
 
 import Text.Heredoc
 
-import PostgREST.Types (PgVersion, pgVersion112)
+import PostgREST.Types (PgVersion, pgVersion112, pgVersion121)
 import Protolude       hiding (get)
 import SpecHelper
 
@@ -833,8 +833,12 @@ spec actualPgVersion = do
 
     it "only returns an empty result set if the in value is empty" $
       get "/items_with_different_col_types?int_data=in.( ,3,4)"
-        `shouldRespondWith`
+        `shouldRespondWith` (
+        if actualPgVersion >= pgVersion121 then
+        [json| {"hint":null,"details":null,"code":"22P02","message":"invalid input syntax for type integer: \"\""} |]
+        else
         [json| {"hint":null,"details":null,"code":"22P02","message":"invalid input syntax for integer: \"\""} |]
+                            )
         { matchStatus = 400
         , matchHeaders = [matchContentTypeJson]
         }
@@ -870,3 +874,9 @@ spec actualPgVersion = do
          {"site":"hub.docker.com", "link":{"url":"http://postgrest.org/en/v6.0/admin.html"}}
         ]|]
         { matchHeaders = [matchContentTypeJson] }
+
+  it "shouldn't produce a Content-Profile header since only a single schema is exposed" $ do
+    r <- get "/items"
+    liftIO $ do
+      let respHeaders = simpleHeaders r
+      respHeaders `shouldSatisfy` noProfileHeader