chore: import upstream snapshot with attribution

extra/example_data/ner_example_data/ner-token-per-line-conll2003.iob

@@ -0,0 +1,70 @@
+-DOCSTART- -X- O O
+
+When WRB _ O
+Sebastian NNP _ B-PERSON
+Thrun NNP _ I-PERSON
+started VBD _ O
+working VBG _ O
+on IN _ O
+self NN _ O
+- HYPH _ O
+driving VBG _ O
+cars NNS _ O
+at IN _ O
+Google NNP _ B-ORG
+in IN _ O
+2007 CD _ B-DATE
+, , _ O
+few JJ _ O
+people NNS _ O
+outside RB _ O
+of IN _ O
+the DT _ O
+company NN _ O
+took VBD _ O
+him PRP _ O
+seriously RB _ O
+. . _ O
+
+“ '' _ O
+I PRP _ O
+can MD _ O
+tell VB _ O
+you PRP _ O
+very RB _ O
+senior JJ _ O
+CEOs NNS _ O
+of IN _ O
+major JJ _ O
+American JJ _ B-NORP
+car NN _ O
+companies NNS _ O
+would MD _ O
+shake VB _ O
+my PRP$ _ O
+hand NN _ O
+and CC _ O
+turn VB _ O
+away RB _ O
+because IN _ O
+I PRP _ O
+was VBD _ O
+n’t RB _ O
+worth JJ _ O
+talking VBG _ O
+to IN _ O
+, , _ O
+” '' _ O
+said VBD _ O
+Thrun NNP _ B-PERSON
+, , _ O
+in IN _ O
+an DT _ O
+interview NN _ O
+with IN _ O
+Recode NNP _ B-ORG
+earlier RBR _ B-DATE
+this DT _ I-DATE
+week NN _ I-DATE
+. . _ O
+