Cli: fix inflation rewards effective slot, block time

[CriesofCarrots]

Problem

As of partitioned epoch rewards activation, the effective slots and block times returned from solana inflation reward that are incorrect, since the cli assumes that all rewards have been delivered in the same slot.

Summary of Changes

• Remove general effective slot and block time from human-readable output
• Deprecate these fields in CliEpochRewardsMetadata and populate with 0 for json output
• Add verbose display that includes effective slot and blocktime for every reward
• Query for correct block time for all reward slots

Fixes #3984

[CriesofCarrots]

Open to suggestions for other/better ways to do this.