feat: Implement volume pricing charge model logic #404
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Context
We want to introduce a new charge model to charge users based on a consumed volume.
The existing graduated pricing does not fit this need because it creates tier, and each tier has its own price.
The volume price works differently, it creates tiers, but the whole number of units is multiplied by the current tier. Then, the number of units consumed determine the total price for each unit.
Description
This PR adds the core charge model logic.
Related Task
This PR follows #394