Describe the enhancement requested

Child of #18014

The current implementation only returns system metadata on the blobs not user set metadata. That means the AzureFileSystem can't round trip the metadata.

As part of this task TEST_F(TestAzuriteFileSystem, WriteMetadata) should probably be updated so that it uses AzureFileSystem to assert that metadata is being written correctly. Currently this tests uses the Azure APIs to fetch the metadata to make this assertion.

Component(s)

C++