Kava 15 Mainnet Upgrade

Objective\n\nKava would be upgraded to Kava 15.\n\n## Description\n\nThis proposal specifies that the Kava 15 upgrade will occur at block height #7,638,000 on Dec 7th, 2023, at approximately 15:00 UTC.\n\nThe release candidate & details for Kava 15 can be reviewed at: https://github.com/Kava-Labs/kava/releases/tag/v0.25.0\n\n## Why is it needed?\n\nThis proposal includes updates for improvements to the x/community module and param changes, along with prerequisite handlers for consolidating community pool funds, disabling inflation, and adjusting staking rewards at a future date.\n\n## Vote Yes\n\nBy voting yes, you agree to upgrade Kava to Kava 15.\n\n## Vote No\n\nBy voting no, you disagree with upgrading Kava to Kava 15.\n\n