Adaptive Inflation: use delegate's parameters to pay rewards

In !8091 (merged), I changed how some rewards were paid:

• on the spendable balance (as before) if AI is not enabled
• on the frozen deposits if AI is enabled.

What should be done instead, once #5746 (closed) is finished, is the following:

• when r rewards must be paid to delegate B (follow !8091 (merged) to see what places to change)
• let e be B's baking_over_staking_edge for the current cycle (as a value between 0 and 1)
  • 0 means the delegate shares everything with costakers
  • 1 means the delegate shares nothing with costakers

Version 1:

• pay r * e on the delegate's spendable balance
• pay r * (1 - e) on the delegate's frozen deposits

Version 2 (takes delegation into account):

• let d and f be the delegated and frozen parts of B stake for the current cycle (as given by the distribution)
• let d' = d / staking_over_delegation_edge
• pay r * (1 - e) * f / (d' + f) on B's frozen deposits
• pay the rest of B's spendable balance

If the distribution is available (probably baking rewards, baking bonuses, endorsing rewards), use V2. If not (probably revelation rewards), use V1.