feat(mlbs): documentation of advanced locality awareness

[lukidzi]

Rendered: https://deploy-preview-1506--kuma.netlify.app/docs/dev/policies/meshloadbalancingstrategy/#advanced-localityawareness

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xref: #1475

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[slonka]

Added some comments and nitpicks and one thing that I think is clearly wrong.

Also, the egress part will be in a separate PR right?

[slonka]

Some changes needed. Also during test Friday we had this situation when we scaled down redis in one zone to 0 instances and then the traffic was completely not working even though we had failover defined. Switching address to .mesh helped. I think we should document this as well. Also should we document the pooling problem? When we only send 1 request concurrently then the connection for subsequent requests is always reused from the pool and it might not be load balanced across different backends (this is more of a demo scenario, not real prod environment, but might be helpful for people just trying this out).

[lahabana]

Can we update this page:
https://kuma.io/docs/dev/policies/locality-aware/ ?

Let's make sure we say folks should stop using this and use our new more expressive feature instead

[lahabana]

These titles are confusing:

It's only advanced because we used to have something before. I think now there should be a single title "laLB" and then subsections:

• default behaviour
• disabling cross-zone routing
• configuring laLB

[lahabana]

LGTM appart from some of these Vale warnings which seem genuine

this is old