fix: mark function properties on runes as deprecated for better intellisense

[dummdidumm]

Ensures that IDEs will order them to the bottom so that the rune variants are on top, better visible

closes #11437

kudos to @ottomated and @AdrianGonz97 for the idea!

Before submitting the PR, please make sure you do the following

• [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• [x] Prefix your PR title with feat:, fix:, chore:, or docs:.
• [x] This message body should clearly illustrate what problems it solves.
• [ ] Ideally, include a test that fails without this PR but passes with it.

Tests and linting

• [x] Run the tests with pnpm test and lint the project with pnpm lint

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 2cc2e7b36d13cbc3138efe5a894e556d596bc75c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------ | ----- | | svelte | Patch |

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR