Add support to report Locality proximity information as part of Load assignment (#6747)
Add support to report Locality proximity information as part of Load assignment (#6747)

Description: Adding API support to report Locality proximity information as part of Locality Assignment. This does not need to be documented yet, and should be documented as part of LB algorithm implementation which will use this information.

Risk Level: LOW
Testing: None

Signed-off-by: Vishal Powar <5daf48484a70ba3000ec672bf21dd4d52cdb93d4@google.com>

envoyproxy/envoy,lyft/envoy,lizan/envoy,eklitzke/envoy,istio/envoy,envoyproxy/envoy,istio/envoy,envoyproxy/envoy-wasm,lyft/envoy,envoyproxy/envoy,istio/envoy,istio/envoy,envoyproxy/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy,jrajahalme/envoy,envoyproxy/envoy,jrajahalme/envoy,lyft/envoy,eklitzke/envoy,envoyproxy/envoy-wasm,envoyproxy/envoy-wasm,envoyproxy/envoy,envoyproxy/envoy-wasm,lyft/envoy,eklitzke/envoy,lizan/envoy,envoyproxy/envoy-wasm,lizan/envoy,eklitzke/envoy,lyft/envoy,jrajahalme/envoy,lizan/envoy,envoyproxy/envoy,istio/envoy,jrajahalme/envoy,envoyproxy/envoy,envoyproxy/envoy,eklitzke/envoy,istio/envoy,envoyproxy/envoy,jrajahalme/envoy,lizan/envoy,istio/envoy,envoyproxy/envoy,eklitzke/envoy,lizan/envoy,lyft/envoy,jrajahalme/envoy,envoyproxy/envoy-wasm