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)
• 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:

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

Related: cinnyapp/cinny-desktop#56

[Airyzz]

If #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.