Rename details to sentry_context

This will help our error reporting in Sentry - so we can understand a
bit better where the errors are coming from.

lib/ruby_snowflake_client.rb

@@ -5,10 +5,12 @@ module Snowflake
   LOG_LEVEL = 0
 
   class Error < StandardError
-    attr_reader :details
+    # This will get pulled through to Sentry, see:
+    # https://github.com/getsentry/sentry-ruby/blob/11ecd254c0d2cae2b327f0348074e849095aa32d/sentry-ruby/lib/sentry/error_event.rb#L31-L33
+    attr_reader :sentry_context
 
     def initialize(details)
-      @details = details
+      @sentry_context = details
     end
   end
 

spec/snowflake/client_spec.rb

@@ -58,7 +58,7 @@
       it "should raise an exception" do
         expect { result }.to raise_error do |error|
           expect(error).to be_a Snowflake::Error
-          expect(error.details).to include(
+          expect(error.sentry_context).to include(
             sql: query
           )
         end