Versioning / updates

[jessjaco]

I'd like to

1. Affix timestamp as metadata to each produced asset
2. Affix version number (likely custom timestamp) to each produced asset
3. (Perhaps maintain separate logging if it's too slow to read assets for metadata)

[jessjaco]

1 & 2 are in the works. For 3, see perhaps https://learn.microsoft.com/en-us/python/api/azure-storage-blob/azure.storage.blob.appendblobservice?view=azure-python-previous

[jessjaco]

3 in testing now via https://github.com/jessjaco/azure-logger