Feat/offline election prediction tool #1405

Job	Run time
set-image	2s
Check documentation	3m 54s
Check code	4m 40s
Build polkadot-staking-miner binary	5m 24s
Check formatting	51s
Run tests	5m 10s
Clippy	5m 29s
Test Docker image build	32s
Build and publish Docker image	0s
	26m 2s

Provide feedback