RPC: rpc to get total baking power

Eugen Zalinescurequested to merge
eugenz@proto-rpc-to-get-total-baking-power into master

What

This MR adds a GET .../helpers/total_baking_power RPC to retrieve the total baking power in the current cycle.

Why

Because it may be useful to have this information (eg to compute the exact baking power fraction a baker has).

Edited by Eugen Zalinescu

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