Feat/offline election prediction tool #1474

Job	Run time
set-image	4s
Check formatting	52s
Build polkadot-staking-miner binary	5m 53s
Check documentation	4m 0s
Clippy	5m 38s
Run tests	5m 15s
Check code	5m 11s
Test Docker image build	28s
Build and publish Docker image	0s
	27m 21s

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