Sharing Buttons Block v2 - first iteration

[jeherve]

Now that we've shipped a first version of the block (see #19694), let's work on an iteration with some improvements.

Sharing Buttons Block v2 - first iteration

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1. Sharing block: ensure compatibility with global settings set in module #34117
   [Block] Sharing Buttons [Feature] Sharing [Type] Enhancement +3
   
2. Sharing Buttons v2: Explore possibility of Custom button #35493
   Customer Report [Block] Sharing Buttons [Feature] Sharing [Pri] Normal [Type] Enhancement +5
3. Sharing Buttons v2: Explore using Sharing Buttons stats #35477
   Customer Report [Block] Sharing Button [Block] Sharing Buttons [Feature] Sharing [Pri] Normal [Type] Enhancement +6
   
4. Sharing Buttons: Add SMS sharing button #35426
   [Block] Sharing Button [Block] Sharing Buttons [Feature] Sharing [Type] Enhancement +4
   
5. Sharing Button Block: add "Web share" button #35533
   [Block] Sharing Button [Block] Sharing Buttons [Feature] Sharing [Pri] Normal [Type] Enhancement +5