Data provider guild

[0xmme]

I've created a data provider for Guild.xyz according to the proposal #1429 .
I created a group generator for the Sismo Contributor Role in Sismo Guild. Works fine.

[0xmme]

@MartinGbz
I enjoyed working with Sismo, so here's a new data provider for Guild.xyz. :)
For questions you can hmu on discord mme#9065

[MartinGbz]

Hey @mme022 so cool! 🔥 thanks!
I will review it today 🙂

[MartinGbz]

@mme022 I pushed a fix, the foreach function doesn't wait the end of each fetch, while for of yes
I also implemented the union data operator in order to merge data without any duplicates 😉

Great job, I merge it! 🙌

[MartinGbz]

I pushed 2 small fixes here #1588 & #1589 because the InterfaceSchema wasn't referenced in the Data Providers index and there was a problem in the a name. That's on me, sorry for that.
The guild Data Provider is now available in the Factory ✅