indexedDB: LQT historical votes table

[TalDerei]

Description of Changes

• LqtHistoricalVotes IndexedDB schema and table
• storage method for saving historical votes during syncing and voting

Related Issue

references #2024 and pairs with prax-wallet/prax#291

Checklist Before Requesting Review

• I have ensured that any relevant minifront changes do not cause the existing extension to break.

[changeset-bot]

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Latest commit: 8f21471

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