Simplified-LTS : Object/Blob storage: Optimize chunk addition by combining create followed by write in a single call

[sachin-j-joshi]

Problem description
Currently ChunkedSegmentStorage makes two calls (create followed by first write) for addition of each new chunk.
This is unnecessary. Object/Blob storage allows to create and write data in a single request we should leverage that.
Problem location
ChunkedSegmentStorage::write and ChunkStorage.

Suggestions for an improvement
Provide another overload to ChunkStorage.create that takes initial data to write and writes it immediately.