Document best practices in routing client requests to a network of peers

[Mingela]

Initially refers to the issue hyperledger-iroha/iroha#4119
In case paginated queries are considered it's crucial to remain communicating with the same node

There 2 solutions basically:

• Infrastructure balancing (proxy)
• SDK/Client application balancing

We tried the first one in an internal project and it seems okay, though generally the best practice would be the second option to eliminate inconveniences listed there https://pauldally.medium.com/session-affinity-and-kubernetes-proceed-with-caution-8e66fd5deb05

SDK side balancing is available in Java SDK though it's incomplete for the use case mentioned hyperledger-iroha/iroha-java#399

For unwrapping the first solution some consultancy by DevOps may be needed