feat: custom collapse behaviour

[12-VidE]

Pull Request Description

When creating a custom Admotion type, the user can specify its default collapse behaviour

Changes Proposed

• Added "collapseType" inside the "Admotion" interface to store the preference
• Added the ablity to select the wanted collapse behaviour when creating a curstom admotion

Related Issues

(Partially) Fixes #335 and a pet-hate of mine

Checklist

• I have read the contribution guidelines and code of conduct.
• I have tested the changes locally and they are working as expected.
• I have added appropriate comments and documentation for the code changes.
• My code follows the coding style and standards of this project.
• I have rebased my branch on the latest main (or master) branch.
• All tests (if applicable) have passed successfully.
• I have run linters and fixed any issues.
• I have checked for any potential security issues or vulnerabilities.

Screenshots (if applicable)

...probably not necessary

Additional Notes

Be aware: I'm basically a novice