Add custom link handlers

[Airyzz]

Description

Adds the ability to add a custom handler for links. Allows for handling matrix.to requests inside Cinny as per #778. It also attempts to invoke a function through Tauri, so Cinny desktop can register its own handlers

It also opens links in a new tab by default

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings

Related: https://github.com/cinnyapp/cinny-desktop/pull/56

[Airyzz]

If https://github.com/cinnyapp/cinny/pull/411 gets merged we can use this implementation for navigating to the correct room

[kfiven]

#411 is closed beacause of #1633 as we have used react-router for navigation. Closing this one as it depend on #411.