[Config] How-to: sharding configuration

[andreyaksenov]

Related doc issues: https://github.com/tarantool/doc/issues?q=is%3Aissue+is%3Aopen+config+label%3A3.0+label%3Aconfig+label%3Avshard

Product: Tarantool
Since: 3.0
Root document: https://www.tarantool.io/en/doc/latest/how-to/vshard_quick/
Sample: sharding/instances.enabled/sharded_cluster
SME: @ Totktonada

Details

Other examples:

• https://gist.github.com/Totktonada/6339517a32cd7df4ac7df700fc3fa6b8
• https://github.com/tarantool/tarantool-cluster-manager/pull/1061/files
• tarantool/tt@06bdb55

Note from @ filonenko-mikhail: document UUID for configuring vshard topology

See also: #3660

[andreyaksenov]

Added a .rockspec file to a sharding sample: #3926