Feat/offline election prediction tool (#1189) #1478

Job	Run time
set-image	3s
Check documentation	3m 57s
Check formatting	52s
Clippy	5m 7s
Run tests	5m 23s
Check code	5m 12s
Build polkadot-staking-miner binary	5m 33s
Build and publish Docker image	33s
Test Docker image build	-1s
	26m 39s

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