Return full JSON exception from USPS rate parser

Let's match the USPS timings parser by returning the full JSON parsing
exception on failure instead of the error message by itself.

Author: pelargir

lib/friendly_shipping/services/usps_ship/parse_rate_estimates_response.rb

@@ -35,7 +35,7 @@ def call(request:, response:)
 
             success(rates, request, response)
           rescue JSON::ParserError, KeyError => e
-            failure(e.message, request, response)
+            failure(e, request, response)
           end
 
           private

spec/friendly_shipping/services/usps_ship/parse_rate_estimates_response_spec.rb

@@ -47,7 +47,7 @@
     it "returns failure" do
       failure = call.failure
       expect(failure).to be_a(FriendlyShipping::ApiResult)
-      expect(failure.data).to eq("unexpected token at 'malformed json'")
+      expect(failure.data).to be_a(JSON::ParserError)
       expect(failure.original_request).to eq(request)
       expect(failure.original_response).to eq(response)
     end

spec/friendly_shipping/services/usps_ship/parse_timings_response_spec.rb

@@ -64,7 +64,6 @@
       failure = call.failure
       expect(failure).to be_a(FriendlyShipping::ApiResult)
       expect(failure.data).to be_a(JSON::ParserError)
-      expect(failure.data.message).to eq("unexpected token at 'malformed json'")
       expect(failure.original_request).to eq(request)
       expect(failure.original_response).to eq(response)
     end