docs: update changes page

[bluwy]

Description

related #18011

I think I got carried away updating the changes page, but feel free to point out if you don't agree with something. Or if this change is not worth it.

• Renamed "Major changes" -> "Breaking changes" (I think major changes are always breaking changes, so better to use a familiar term?)
• Renamed the sections to "Planned", "Considering", "Past"
  • "Planned": We've decided this is a breaking change we want to do in the future
  • "Considering": Still considering if we want to do this breaking change
  • "Past": Past breaking changes, or things we have decided not to do
• Added a future option docs in the shared-options.md page.

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[patak-dev]

One reason to call it "Major Changes" was to avoid the need to force us to document every Breaking Change in the same way. It is kind of "Major Breaking Changes". But probably having breaking here is more clear and we don't need to feel the pressure to have small breaking changes guides.

[bluwy]

That's true, maybe we can mention not all breaking changes are listed here? Or do you think we should still stick with major changes?

[patak-dev]

Let's merge and then we can continue refining this later. I think we should at least mention that only major breaking changes will be documented in this way