Feat/offline election prediction tool #1415

Job	Run time
set-image	2s
Run tests	5m 18s
Build polkadot-staking-miner binary	5m 37s
Clippy	5m 35s
Check formatting	1m 5s
Check code	5m 0s
Check documentation	4m 5s
Test Docker image build	26s
Build and publish Docker image	0s
	27m 8s

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