Use random bnode generator on Turtle/TriG decoders by default

CHANGELOG.md

@@ -46,6 +46,11 @@ Elixir v1.15 or later, where this issue has been resolved.
 
 ### Changed
 
+- Default blank node generation in Turtle decoder now generates random blank node 
+  identifiers instead of the previous deterministic incremented identifiers. 
+  This change ensures unique blank nodes across multiple parsing operations.
+  You can opt back to the previous behaviour with the new `turtle_trig_decoder_bnode_gen` 
+  application config using the `:increment` value.
 - The `prefixes` of an `RDF.Graph` are now always a `RDF.PrefixMap` and no longer `nil`
   initially, since this had the confusing consequence that an `RDF.Graph` where all 
   prefixes were deleted was not equal to same graph where the deleted were never set,

config/test.exs

@@ -1,3 +1,5 @@
 import Config
 
 config :rdf, :earl_formatter, author_iri: "http://marcelotto.net/#me"
+
+config :rdf, turtle_trig_decoder_bnode_gen: :increment

lib/rdf/serializations/turtle_trig/decoder/state.ex

@@ -5,7 +5,7 @@ defmodule RDF.TurtleTriG.Decoder.State do
 
   alias RDF.BlankNode
 
-  @default_turtle_trig_decoder_bnode_gen :increment
+  @default_turtle_trig_decoder_bnode_gen :random
 
   def default_bnode_gen do
     Application.get_env(