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[BUG] SDKv12 crashes during GetBlockList for blobs with large blocks

See original GitHub issue

Describe the bug Int32 overflow exception when parsing blobs with large block >2.1GiB after calling GetBlockListAsync(…).

Expected behavior A BlockList to be returned without an exception.

Actual behavior (include Exception or Stack Trace) An OverflowException is being thrown:

{
  "ExceptionMessage":"Value was either too large or too small for an Int32.","ExceptionType":"OverflowException","ExceptionStack":"
   at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)\r\n
   at Azure.Storage.Blobs.Models.BlobBlock.FromXml(XElement element)\r\n
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()\r\n
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)\r\n
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)\r\n
   at Azure.Storage.Blobs.Models.BlockList.FromXml(XElement element)\r\n
   at Azure.Storage.Blobs.BlobRestClient.BlockBlob.GetBlockListAsync_CreateResponse(ClientDiagnostics clientDiagnostics, Response response)\r\n
   at Azure.Storage.Blobs.BlobRestClient.BlockBlob.<GetBlockListAsync>d__12.MoveNext()\r\n
--- End of stack trace from previous location where exception was thrown ---\r\n
   […]
}

To Reproduce

Create a blob with any block size > Int32.MaxValue.
Call GetBlockListAsync(…) from SDK for that created blob.

Environment:

Name and version of the Library package used: Azure.Storage.Blobs 12.7.0
Hosting platform or OS and .NET runtime version: Windows 10 .NET Framework 4.7.2
IDE and version : Visual Studio 16.5

Alias ergros