[Indices] Add number of primary shards and number of replicas in the indices grid

[rbayet]

Is your feature request related to a problem? Please describe.
It is now possible to configure Elasticsuite to have a different number of primary shards and/or replicas per index type.
Additionally, behavioral data indices are never "re-constructed" so their number of primary shards and/or replicas might not reflect the current configuration settings but instead will reflect the number of primary shards and/or replicas at the moment they were created.

It could be nice to see at the first glance those indices' configuration in the indices grid.

Describe the solution you'd like
Add two columns "Shards" and "Replicas" to the indices grid to display respectively for each index

• the number of configured primary shards
• the number of replicas

[rbayet]

Implemented through #3477