Klay -> Kaia in fund names

[ian0371]

Proposed changes

• Change names: kcf -> kef, kff -> kif (affects kaia_getStakingInfo)
• Consider StakingInfo DB backward compatibilty (Remove KIR/PoC and introduce KCF/KFF from API returns and internal code  #1792)

Types of changes

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• Bugfix
• New feature or enhancement
• Others

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