croissant.json: map containedIn to cr:containedIn (Croissant 1.1 context)

Under conformsTo Croissant 1.1, mlcroissant reads FileSet containment as cr:containedIn; without the mapping every FileSet was read as a local folder and no image or annotation records could be generated. Data files unchanged; SHA256SUMS updated for croissant.json.

SHA256SUMS

@@ -12163,7 +12163,7 @@ ac8cae8c49a569e22170dcacba0e2f048ed3489246f7b1ace32b305a6209023c  clean/tier_nev
 1261e6ea0cc972ee76422ea5771d7fc51f8caeeb6a78eb356cc2084a687094be  clean/tier_never_k4/images/v2_tier_never_k4__a079_s0023.png
 afd09a221e29c9963ba0d4f0314e721331035718e99d515ecd9fc442ccf41c86  clean/tier_never_k4/images/v2_tier_never_k4__a079_s0025.png
 0b74a408086635e4af44da264f97e935517a89285d00b52b891d6e5ee1eed8b4  clean/tier_never_k4/images/v2_tier_never_k4__a079_s0026.png
-0807ee4f52524a4a0a9815f44593b083e9a1442f5403c81e3e88665be8d7cd60  croissant.json
+5e928a1d7d54e3ab0b52accac55fe3037d6be5ed4e1c058307462bd99d9d2798  croissant.json
 3c4d3e8b9e2732beb7fc59942745b764c8507e49634fc1dc1a4873a7c593c946  heldout_class_scene_ids.txt
 db9ddbac6e760e291c4186d1271297f8dab9e13fcec628226f22b8a30d217c53  samples/tier1_atypical_bg/annotations.json
 23c5915cfe0e905affa30be841eb0971f9278ac7fa1ebca947d1a527fcca589e  samples/tier1_atypical_bg/images/v2_tier1_atypical_bg__a007_s0005.png

croissant.json

@@ -2,9 +2,11 @@
   "@context": {
     "@language": "en",
     "@vocab": "https://schema.org/",
+    "arrayShape": "cr:arrayShape",
     "citeAs": "cr:citeAs",
     "column": "cr:column",
     "conformsTo": "dct:conformsTo",
+    "containedIn": "cr:containedIn",
     "cr": "http://mlcommons.org/croissant/",
     "rai": "http://mlcommons.org/croissant/RAI/",
     "prov": "http://www.w3.org/ns/prov#",
@@ -17,6 +19,9 @@
       "@type": "@vocab"
     },
     "dct": "http://purl.org/dc/terms/",
+    "description": {
+      "@container": "@language"
+    },
     "examples": {
       "@id": "cr:examples",
       "@type": "@json"
@@ -28,10 +33,14 @@
     "fileSet": "cr:fileSet",
     "format": "cr:format",
     "includes": "cr:includes",
+    "isArray": "cr:isArray",
     "isLiveDataset": "cr:isLiveDataset",
     "jsonPath": "cr:jsonPath",
     "key": "cr:key",
     "md5": "cr:md5",
+    "name": {
+      "@container": "@language"
+    },
     "parentField": "cr:parentField",
     "path": "cr:path",
     "recordSet": "cr:recordSet",