[#1363] Account balances in the SynchronizerState

[LukasKorba]

Closes #1363

• changelog update
• scanAction reports the initial after-scan value immediately instead of after X scans
• SynchronizerState has been refactored, we no longer call 2 rust methods to get shielded verified + total balances
• tests refactored to reflect this change
• mocks regenerated
• Sourcery version bumped

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[str4d]

Post-hoc utACK