t0115: add dir listing test

fixtures/t0115/README.md

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+# Dataset description/sources
+
+- fixtures.car
+  - raw CARv1
+
+generated with:
+
+```sh
+# using ipfs version 0.18.1
+mkdir -p rootDir/ipfs &&
+mkdir -p rootDir/ipns &&
+mkdir -p rootDir/api &&
+mkdir -p rootDir/ą/ę &&
+echo "I am a txt file on path with utf8" > rootDir/ą/ę/file-źł.txt &&
+echo "I am a txt file in confusing /api dir" > rootDir/api/file.txt &&
+echo "I am a txt file in confusing /ipfs dir" > rootDir/ipfs/file.txt &&
+echo "I am a txt file in confusing /ipns dir" > rootDir/ipns/file.txt &&
+DIR_CID=$(ipfs add -Qr --cid-version 1 rootDir) &&
+FILE_CID=$(ipfs files stat --enc=json /ipfs/$DIR_CID/ą/ę/file-źł.txt | jq -r .Hash) &&
+FILE_SIZE=$(ipfs files stat --enc=json /ipfs/$DIR_CID/ą/ę/file-źł.txt | jq -r .Size)
+echo "$FILE_CID / $FILE_SIZE"
+
+echo DIR_CID=${DIR_CID}
+echo FILE_CID=${FILE_CID}
+echo FILE_SIZE=${FILE_SIZE}
+
+ipfs dag export ${DIR_CID} > ./fixtures.car
+
+# DIR_CID=bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i # ./rootDir/
+# FILE_CID=bafkreialihlqnf5uwo4byh4n3cmwlntwqzxxs2fg5vanqdi3d7tb2l5xkm # ./rootDir/ą/ę/file-źł.txt
+# FILE_SIZE=34
+```

fixtures/t0115/dnslink.yml

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+# yaml-language-server: $schema=../fixture.schema.json
+dnslinks:
+  website:
+    subdomain: website
+    path: /ipfs/bafybeig6ka5mlwkl4subqhaiatalkcleo4jgnr3hqwvpmsqfca27cijp3i # ./rootDir/