[DOC] Add an ecosystem page

[beeme1mr]

Change in the documentation

Add a section in the docs that highlights the OpenFeature ecosystem.

This should include:

• All the vendors and tools that have OpenFeature providers and for what language
• An overview of every OpenFeature SDK, what's the latest version, and what level of the spec is it compliment with
• All the hooks and extensions that are available.

Examples:

• https://opentelemetry.io/ecosystem/

Follow-up

• Include a link from the main landing page to the ecosystem page.

[toddbaert]

I'm interested in doing this... I think somebody mentioned something about it in a meeting, it might have been @beeme1mr or @moredip - something about a table/grid maybe? I like the term ecosystem but I'd like something with more visual pop than the OTel link. TBH I like what we have now more than that.

[beeme1mr]

I think a grid or table that can easily be filtered and sorted would work well. I'll try and find some examples when I have a moment.