refactor!: fix epoch database structure

[stringhandler]

Description

Changes the epoch, validator and committee structure in the global database.

Motivation and Context

Previously, validator nodes did not deregister and this resulted in a bug that caused the committees for epochs to not be correct.

How Has This Been Tested?

Existing tests, and manual testing

Breaking Changes

• None
• Requires data directory to be deleted
• Other - Please specify

BREAKING CHANGE: Data directory must be cleaned

[github-actions]

Test Results (CI)

532 tests   - 1   532 ✅  - 1   1h 43m 46s ⏱️ - 39m 47s
 63 suites ±0     0 💤 ±0 
  2 files   ±0     0 ❌ ±0 

Results for commit 96a13cf. ± Comparison against base commit 533d82e.

This pull request removes 15 and adds 14 tests. Note that renamed tests count towards both.

Scenario: Claim and transfer confidential assets via wallet daemon: tests/features/wallet_daemon.feature:89:3
Scenario: Concurrent calls to the Counter template: tests/features/concurrency.feature:7:3
Scenario: Confidential transfer to unexisting account: tests/features/transfer.feature:163:3
Scenario: Counter template registration and invocation: tests/features/counter.feature:7:3
Scenario: Create account and transfer faucets via wallet daemon: tests/features/wallet_daemon.feature:7:3
Scenario: Create and mint account NFT: tests/features/wallet_daemon.feature:133:3
Scenario: Create resource and mint in one transaction: tests/features/nft.feature:73:3
Scenario: EpochEnd and EpochStart commands are used on epoch change: tests/features/epoch_change.feature:7:3
Scenario: Mint fungible tokens: tests/features/fungible.feature:7:3
Scenario: Mint, mutate and burn non fungible tokens: tests/features/nft.feature:7:3
…

Scenario: Claim and transfer confidential assets via wallet daemon: tests/features/wallet_daemon.feature:90:3
Scenario: Concurrent calls to the Counter template: tests/features/concurrency.feature:8:3
Scenario: Confidential transfer to unexisting account: tests/features/transfer.feature:164:3
Scenario: Counter template registration and invocation: tests/features/counter.feature:8:3
Scenario: Create account and transfer faucets via wallet daemon: tests/features/wallet_daemon.feature:8:3
Scenario: Create and mint account NFT: tests/features/wallet_daemon.feature:134:3
Scenario: Create resource and mint in one transaction: tests/features/nft.feature:74:3
Scenario: EpochEnd and EpochStart commands are used on epoch change: tests/features/epoch_change.feature:8:3
Scenario: Mint fungible tokens: tests/features/fungible.feature:8:3
Scenario: Mint, mutate and burn non fungible tokens: tests/features/nft.feature:8:3
…

♻️ This comment has been updated with latest results.