feat: support more link types

[SillyCoon]

According to AppFlowy-IO/AppFlowy#5146 I added support of mailto and file URIs.

It's also possible to use built-in Uri.tryParse to support any URI, but I'm not sure if this is a good idea since it allows any schema (e.g. javascript too) and probably should be validated more.

So for now I left it simple.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.48%. Comparing base (b6bfd11) to head (f943c48).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/editor/util/link_util.dart	60.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #876   +/-   ##
=======================================
  Coverage   72.48%   72.48%           
=======================================
  Files         316      317    +1     
  Lines       14757    14771   +14     
=======================================
+ Hits        10696    10707   +11     
- Misses       4061     4064    +3     

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