dApp Staking v3 - improvements & fixes

[Dinonard]

Summary

Various fixes & minor improvements as the result of retro-review, testing, etc.

Minor Changes

• rename precompile unit tests
• lots of typo fixes
• apply retro review suggestions
• rename reward_destination field into reward_beneficiary

Incorrect staked and staked_future

It was possible for the stake operation to incorrectly manipulate staked and staked_future values
in the AccountLedger struct. As a result, staker could increase the stake of their historical era, incorrectly.

This has been fixed by ensuring proper move operation from staked_future over to staked.

[github-actions]

Package	Line Rate	Branch Rate	Health
pallets/dapp-staking-v3/src/benchmarking	0%	0%	❌
pallets/dapps-staking/src/pallet	85%	0%	✔
chain-extensions/types/xvm/src	0%	0%	❌
pallets/unified-accounts/src	84%	0%	✔
precompiles/xvm/src	74%	0%	➖
precompiles/dapps-staking/src	94%	0%	✔
pallets/dapp-staking-v3/rpc/runtime-api/src	0%	0%	❌
pallets/dynamic-evm-base-fee/src	81%	0%	✔
pallets/xc-asset-config/src	53%	0%	➖
pallets/dapp-staking-v3/src/test	0%	0%	❌
pallets/static-price-provider/src	61%	0%	➖
precompiles/dapp-staking-v3/src/test	0%	0%	❌
precompiles/dapp-staking-v3/src	90%	0%	✔
chain-extensions/pallet-assets/src	56%	0%	➖
pallets/collator-selection/src	69%	0%	➖
precompiles/assets-erc20/src	81%	0%	✔
chain-extensions/types/unified-accounts/src	0%	0%	❌
precompiles/unified-accounts/src	100%	0%	✔
precompiles/sr25519/src	64%	0%	➖
chain-extensions/types/assets/src	0%	0%	❌
precompiles/xcm/src	72%	0%	➖
chain-extensions/unified-accounts/src	0%	0%	❌
pallets/dapps-staking/src	81%	0%	✔
pallets/block-rewards-hybrid/src	87%	0%	✔
precompiles/substrate-ecdsa/src	74%	0%	➖
pallets/inflation/src	70%	0%	➖
pallets/dapp-staking-migration/src	39%	0%	❌
pallets/dapp-staking-v3/src	76%	0%	➖
pallets/ethereum-checked/src	48%	0%	❌
pallets/xvm/src	40%	0%	❌
primitives/src/xcm	66%	0%	➖
primitives/src	66%	0%	➖
chain-extensions/xvm/src	0%	0%	❌
Summary	70% (3249 / 4623)	0% (0 / 0)	➖

Minimum allowed line rate is 50%

[ashutoshvarma]

LGTM