Add QA for train split for triviaqa-rc wikiqa

wikiqa/train.json

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:516493c41b006c41227e31560e791b059b1c03c1b79d226ac2043dbf7664441b
-size 133793602
+oid sha256:b09c8313a23fdadb7a3aec09e3952ca3854505b0698bdcb41cb43f770b9994c6
+size 29675814