[OCS] Support for dynamic bucket size based on rate of data consumption.

[vihangpatil]

Problem description

We end up configuring a large bucket size on PGW, OCSGW or OCS which can handle fastest data consumption.
But most of the users do not consume data at a peak rate.
Due to the large bucket size, the consumption happens in large steps (of 100 MB, for e.g.).
There is also a risk of large data to be unaccounted for due to technical issues like restart in components or delayed/lost messages between them.

Solution

Instead of having a large bucket size to handle the fastest data consumption, the bucket size should be proportionate for the moderate data consumption, but which can dynamically increase if someone is consuming at higher rates.