feat: Split reference and smart picker functions from components

[juliusknorr]

This change allows importing reference widget registration methods without pulling a large dependency chain of vue components in right away. That way one can reduce the bundle size of entrypoints quite a bit when moving required components to be lazy imported.

For tables this brings down the entrypoint from 4MB to 16KB

🖼️ Screenshots

🏚️ Before	🏡 After

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable

[juliusknorr]

Not entirely sure about the structure, which is any suggestions would be welcome to improve of course ;)

[ShGKme]

Cool!

Looks fine according to the code and the dist looks fine.

Not entirely sure about the structure, which is any suggestions would be welcome to improve of course ;)

Currently there is no better place, I think.

An alternative would be to add a new folder, add it to build and to package.exports. I'm also not a fun of the current "separate by file type" structure. But we can rethink it for v9 or v10.

[juliusknorr]

/backport to next

[backportbot]

The backport to next failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout next
git pull origin next

# Create the new backport branch
git checkout -b backport/5218/next

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 93c57090

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/5218/next

Error: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[juliusknorr]

/backport to next

[backportbot]

The backport to next failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout next
git pull origin next

# Create the new backport branch
git checkout -b backport/5218/next

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 93c57090

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/5218/next

Error: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[juliusknorr]

Already present in next