Add Exaion as RPC provider

[tupui]

I am opening this to add Exaion as a RPC provider and also to discuss the general structure of the service providers in the docs.

Exaion first: https://crypto.exaion.com/protocols/stellar

From the French electricity and already being used behind the scene by real businesses.

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(I can spin this off into an issue if wanted.)

On the structure. After #2055 we now have a few pages for service providers: API, Analytics, Indexers and Oracles.

I had a hard time to find some providers as I was expected them to be in indexers and they ended up being in Analytics. E.g. SonarX, whose description states that it is an indexer. I was also looking for Quasar and saw that there was a specific page for Galexie provider. Same goes with Dune which I also thought would be listed as an indexer.

After discussing with @chadoh and others, we all seem to have varying definitions on what is an indexer, a data provider, something else.

Hence, I would suggest to flatten and simplify the structure to help users find their way. Have a single Analytics-Indexing section (name to be defined) and have a single provider page for it, with sections if we want to separate concerns.

Reviewing this, I also found some other services which could be added: Zettablock (I read there is a SDF partnership even?), Bitwave (had a SCF), BlockEden, 3xpl, Ginco, Bitquery.

Some products seem to also gain capabilities. e.g. Quicknode shows on their page that indexing like features might be coming soon. Same with validationcloud with their new Mavrik Data x Ai.

I am happy to work on making a proposal. Let me know!

cc @johncanneto

[ElliotFriend]

Thanks for the contribution and thoughts, @tupui !!

You bring up some great points and really important things to consider. I tend to agree that the data/providers pages can be somewhat confusing to navigate and figure out the lay of the land.

I think it would make the most sense to spin that into an issue of its own where we could figure out and discuss a better strategy. That way we can get this simple addition added and merged without waiting on any other conversation or decisions.

How does that sound to you?

As a heads-up: SDF is on a holiday break until the new year. So, you may not hear much input from others until then.

[tupui]

Hey @ElliotFriend 👋

Same here haha. Merry Christmas to you and the team and a happy new year 🎊!!

I will make an issue with the last part of my message 👍