Add CLI command to claim rewards

[alpe]

This is missing in the CLI. Current workflow is to use the frontend.

Current workaround is to interact with the distribution contract directly via:

tgrade tx wasm execute $(tgrade q poe contract-address DISTRIBUTION -o json |jq -r '.address') '{"withdraw_funds":{}}' --from YOUR_KEY_NAME  --chain-id=tgrade-testnet-3 --gas-prices=0.05utgd -b block

The cli command can be grouped within the PoE module commands.

The poe unjail command can be used as a template how to interact with a contract.

When properly integrated, then we should see the new command listed in tgrade tx poe -h.

[alpe]

Moving to a post mainnet milestone as a workaround exists

[alpe]

The message was renamed in the contract to: {"withdraw_rewards":{}}, meanwhile

[alpe]

Note: DISTRIBUTION + ENGAGEMENT rewards can be claimed.