factor verified providers into bidding tx flow

x/colinearcore/auctionconfig/config.go

@@ -12,6 +12,10 @@ const (
 	MinLeasePeriod = 3_600     // 1 hour
 	MaxLeasePeriod = 8_035_200 // 3 months
 
+	// Maximum number of verified providers; this is to prevent buffer overflow
+	// attacks since provider list is not committed to chain state and costs 0 gas
+	MaxVerifiedProviders = 1000
+
 	// Minimum required staked CLR to be a provider (i.e. to bid)
 	// 500 CLR
 	ProviderMinLockedUClr = 500_000_000