Unequal cost multipath for EVPN Type-5 overlay traffic engineering

With this feature, the border leaf device distributes traffic based on the weight assigned to each leaf device. The weight parameter represents the number of compute nodes connected to the same leaf that share the anycast address. Each leaf device advertises the number of connected compute nodes to the border leaf device through EVPN Type-5 routes. The border leaf device then collects this information from all leaf devices and distributes traffic proportionally based on the compute node count.