out_azure_blob: increase buffer dir name size to avoid truncating the directory

**Is your feature request related to a problem? Please describe.**
Inside the `plugins/out_azure_blob/azure_blob.c` in the `azure_blob_store_init()` method, we set `char tmp[64];`. This is causing an issue for when the output directory names are too long, then become truncated.

**Describe the solution you'd like**
Could we make it longer to `1024` as is the case in other outputs like S3?

Open plugins/out_azure_blob/azure_blob.c and locate the azure_blob_store_init() method and its tmp buffer declaration. Compare the requested size with the sizing used by other outputs such as S3. Done means directory names up to the intended size are no longer truncated.

Written by the indexing model from the issue text.