Add fields to AzureBlob output plugin

[BHYub]

What this PR does / why we need it:

Add missing fields in AzureBlob output plugin
Adding these fields :

• compressBlob
• bufferingEnabled
• uploadTimeout
• uploadFileSize

Which issue(s) this PR fixes:

Fixes #1719
Not only this field but three additional fields

Does this PR introduced a user-facing change?

Having the following fields available for the AzureBlob plugin output : 
- compressBlob
- bufferingEnabled
- uploadTimeout
- uploadFileSize

Additional documentation, usage docs, etc.:

Usage:

- compressBlob : 	(on;off). Optional: Enables GZIP compression in the final blockblob file. This option isn't compatible when blob_type = appendblob.
- bufferingEnabled : (true;false).  Enable buffering into disk before ingesting into Azure Blob.
- uploadTimeout : Optional. Specify a timeout for uploads. Fluent Bit will start ingesting buffer files which have been created more than x minutes ago and haven't reached upload_file_size limit yet. Defaults to 30m.
- uploadFileSize : Specifies the size of files to be uploaded in MB. Defaults to 200M.

[cw-Guo]

Hi @BHYub, thanks for the contributions! can you please run make docs-update to update the documents too?