Signaling proposal for validator fee settings and min-fee parameter

Description

This proposal is intended to signal a change of the accepted gas fees by Secret validators. /n /n Simultaneously it should be seen as a signalling proposal to change the not yet implemented min-gas-fee parameter to 0.05uSCRT. /n /n This is a follow-up on proposal #260 /n /n Proposed fee tiers: /n Low: 0.05 uSCRT /n Med: 0.1 uSCRT (2x lower option) /n high: 0.25 uSCRT (2.5x lower option) /n /n Forum post: https://forum.scrt.network/t/signalling-proposal-change-reduce-secret-gas-fee-tiering/7185 /n /n proposer: Ertemann - Lavender.Five Nodes