Support MinIO to be deployed on more than 32 nodes (#8492)

This PR implements locking from a global entity into
a more localized set level entity, allowing for locks
to be held only on the resources which are writing
to a collection of disks rather than a global level.

In this process this PR also removes the top-level
limit of 32 nodes to an unlimited number of nodes. This
is a precursor change before bring in bucket expansion.

cmd/gateway-main.go

@@ -142,8 +142,6 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 	// Set system resources to maximum.
 	logger.LogIf(context.Background(), setMaxResources())
 
-	initNSLock(false) // Enable local namespace lock.
-
 	// Set when gateway is enabled
 	globalIsGateway = true