[Docs RFC]Add information about vectrorized aggregates to the docs

[billy-the-fish]

The vectorized query execution pipeline works automatically for some queries over the compressed hypertables, no user configuration is required.

Add a short explanation in https://docs.timescale.com/use-timescale/latest/compression/about-compression/ and link out to https://www.timescale.com/blog/teaching-postgres-new-tricks-simd-vectorization-for-faster-analytical-queries/?

@akuzm does this sound about right? Do you have any source material I could use for this page?

@jamessewell does this work for you?

[iroussos]

@billy-the-fish @akuzm Vectorized execution / aggregation is going to be a major feature of what we offer going forward. I think that we should get started with adding a dedicated page for it, explain what it is and why it matters and have room to talk about all the types of queries supported, etc.

We can link to the blog post for sure, but my opinion is that we need to have the important information on our docs as well.

And then we need a full section on what works and for which versions - something that is missing from the blog post. For example, which queries are vectorized in 2.16, 2.17? What are the gotchas? etc