Adjust Queue System and FCFS Mechanism for Rewards conversion

This proposal, if passed, will apply a queue system and FCFS mechanism for in-game currency () to governance tokens () conversion to control the supply of released into circulation and prevent long-term inflation of the . This helps sustain xNinja game economy in long term.\n\nOld mechanism:\n- Users have to wait a minimum of 7 days to convert in-game currency () to governance tokens (). This is not the best solution to retain players in long term because users commitment decreases over time.\n\nNew mechanism:\n- The allocated amount of governance tokens for in-game currency () is fixed daily.\n- Each user can only execute a conversion order of from 75 to 150 at a time. After their withdrawal order is completed, they can place another conversion order. Each user placing a conversion order is considered to be in the queue. The larger the queue, the longer the number of days it may take to receive the tokens. This follows the First Come First Serve (FCFS) mechanism widely applied in the crypto market.\n- For example, if -> conversion demand is low, users may need to wait for short period of time to complete the conversion, which increases users incentives playing xNinja. If -> conversion demand is high, then the queue will help the game ecosystem stay stable in the long run, which is good to both xNinja project & users for long-term commitment & growth.\n- For more details, refer to the governance forum post: https://gov.injective.network/discussion/15464-xninjatech-adjust-queue-system-and-fcfs-mechanism-for-rewards-conversion