Move error constants to binding module and more 3-case evaluation model alignment

Author: sameerank

lib/datadog/open_feature/ext.rb

@@ -3,24 +3,11 @@
 module Datadog
   module OpenFeature
     module Ext
-      # OpenFeature error codes  
       ERROR = 'ERROR'
       INITIALIZING = 'INITIALIZING'
       UNKNOWN_TYPE = 'UNKNOWN_TYPE'
       PROVIDER_FATAL = 'PROVIDER_FATAL'
       PROVIDER_NOT_READY = 'PROVIDER_NOT_READY'
-      TYPE_MISMATCH = 'TYPE_MISMATCH'
-      PARSE_ERROR = 'PARSE_ERROR'
-      FLAG_NOT_FOUND = 'FLAG_NOT_FOUND'
-      
-      # Rust EvaluationError enum values (internal error codes)
-      TYPE_MISMATCH_ERROR = 'TypeMismatch'
-      CONFIGURATION_PARSE_ERROR = 'ConfigurationParseError'
-      CONFIGURATION_MISSING = 'ConfigurationMissing'
-      FLAG_UNRECOGNIZED_OR_DISABLED = 'FlagUnrecognizedOrDisabled'
-      FLAG_DISABLED = 'FlagDisabled'
-      DEFAULT_ALLOCATION_NULL = 'DefaultAllocationNull'
-      INTERNAL_ERROR = 'Internal'
     end
   end
 end