Add the ability to add search indexes to existing instances

[YevhenPetlovanyi]

After adding the SXA module, according to the Installation Guide for SXA, you need to manually create cores in Solr for "sitecore_sxa_master_index" and "sitecore_sxa_web_index" indexes and update the patch files so that indexes look at the corresponding cores.
Adding this SIM feature will allow you to automatically add indexes without having to do it manually.

Valid for version: SIM 1.18.0

I hereby confirm the issue is new:

• all SIM prerequisites are met
• it is not a known issue or existing issue

[DmitryKolinchuk]

Implementation details:

1. The button near the "Install Packages" button should be added.
2. This function should search for existing Solr cores based on the existing configuration of search indexes in Sitecore.
3. If cores are missing then it should propose to create them.
4. It should be possible (optionally) to populate managed schema and rebuild a search index after creation a core.