feat: Added caching to top users in all time leaderboard (@LuckySilver0021)

[LuckySilver0021]

Description

• Fixes issues with #7447
• Added mode2 to AllTimeCacheKey type and getKey() method
• Removed timestamp from CacheEntry - now only {data, count} exists
• Deleted TTL constant (15min) and all timestamp expiration checks
• Removed unnessasory try-catch blocks around cache.set() method calls

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Closes #

[fehmer]

hi @LuckySilver0021 , please add all changes to #7447 instead. No need to open another PR