feat: Add oracle module #392

Adds the oracle module in the `x` folder. Oracle module is responsible for: - Tally all the votes sent by the validators through the `oracle-feeder` within the voting period and calculate the median. - Select the validators who have voted within the reasonable spread. - Distribute the reward to the selected validators from the reward pool. - Slash the validator whose vote rate is less than the `minValidPerWindow`. - Funds for the reward pool will be transferred through the `fund-reward-pool` command. - Reward pool can be queried through the `reward-pool-balance` command. At the last block of the voting period, the votes of all the valid validators will be tallied and the median will be calculated. Validators who have voted within the reasonable spread will be rewarded. The reward will be decided based on the reward band and their voting power and the validator who has voted less than the minimum valid vote per window will be slashed(jailed). The reward will be distributed from the reward pool account controlled by the oracle module and the funds to the reward pool can be transferred through the `fund-reward-pool` command from any address.

1. Overview This PR improves the keeper test suite layout. It separates helper functions into x/oracle/testutil package, which can be reused (that's a canonical way to do it), also cleanups the test setup stage that runs before each step. I moved a chunk of logic from ABCI handler into keeper to make it testable (the Tally and related ballot logic). Also, implemented a unit test that checks slashing, that improves test coverage for now. 2. Implementation details Rationale for this is to have better test organisation and coverage. There is also to demonstrate a way how to test slashing.

1. Overview - Filter out the exchange rates which have votes below the vote threshold `< 50%`. - Remove the `ValidatorsPowerStoreIterator` and instead use `GetBondedValidatorsByPower`. - Refactor. --------- Co-authored-by: Max Kupriianov <max@kc.vc>

1. Overview Update oracle exchange_rate response to return the exchange rate of an asset in string. Separate exchange_rate and all_exchange_rates queries. 2. Implementation details Created two separate oracle queries exchange_rate, and all_exchange_rates. exchange_rate: Takes the asset symbol as a request and returns its exchange in string. all_exchange_rates: Doesn't take any request and returns exchange rates of all the assets stored on chain in sdk.DecCoins

1. Overview Add more tests in x/types. Change v.BaseDenom to v.SymbolDenom in tally.go. Since we are using symbol everywhere.

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feat: Add oracle module #392

feat: Add oracle module #392

Commits on Apr 14, 2023