Instant staking

[unknownunknown1]

This change relies heavliy on the new feature that wasn't present in the older version which is the removal of the old delayed stake.
When the juror changes his stake while there is already a delayed stake present for this juror, the old stake will simply be nullified and skipped upon delayed stake execution. Its index will still be there but it'll point to an empty struct. Also this applies to automatic staking (e.g. when inactive juror is penalized), thus it'll also remove the existing delayed stake for this juror. In order for this to work I had to restore the old stakeOf() function which returns the current stake that is stored in the sortition. This is needed because the sortition stake is unaffected by the partial staking, thus I can revert to this value if a partially delayed stake gets removed/replaced.
Overall, I tried to come up with a solution that doesn't complicate the existing code while also being reliable, and the option to remove the old delayed stake seems like an optimal one.
Also, the delayed stake can be manually removed by the juror if he staked by mistake (e.g. staked in the court where he didn't want to stake).

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PR-Codex overview

This PR focuses on improving the arbitration functionality by making changes to the KlerosCore contract and related files.

Detailed summary

• Added timeout configuration for Mocha tests in hardhat.config.ts.
• Updated usage of core.getJurorBalance to core.sortitionModule().getJurorBalance in DisputeKitClassic.sol and DisputeKitSybilResistant.sol.
• Updated event handler names in subgraph.yaml.
• Renamed event StakeDelayed to StakeDelayedNotTransferred in KlerosCore.ts.
• Updated usage of core.getJurorBalance to sortitionModule.getJurorBalance in integration tests.
• Added new functions lockStake, unlockStake, penalizeStake, and updated setStake in ISortitionModule.sol.
• Updated usage of core.getJurorBalance to sortitionModule.getJurorBalance in draw.ts.
• Removed struct Juror and related mappings in KlerosCore.sol.

The following files were skipped due to too many changes: contracts/src/arbitration/KlerosCore.sol, contracts/test/arbitration/staking.ts, contracts/src/arbitration/SortitionModule.sol

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[sonarcloud]

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[codeclimate]

Code Climate has analyzed commit 6cbe8c4 and detected 26 issues on this pull request.

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Category	Count
Complexity	1
Duplication	24
Style	1

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