feat: CNS-1009 - estimated rewards query by cu

[oren-lava]

Description

Closes: #XXXX

Re-implemented the estimate-rewards query to present a more accurate rewards estimation, by CU usage.

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[omerlavanet]

missing adding tracked cu in the estimation to the provider in case the delegator adds more stake

[oren-lava]

missing adding tracked cu in the estimation to the provider in case the delegator adds more stake

done. see 615cbd8