Feat/offline election prediction tool #1477

Job	Run time
set-image	3s
Run tests	3m 54s
Check documentation	1m 29s
Build polkadot-staking-miner binary	4m 1s
Check code	2m 30s
Check formatting	1m 54s
Clippy	3m 16s
Test Docker image build	23s
Build and publish Docker image	-1s
	17m 29s

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