--experimental not configurable with .editorconfig

[vojkny]

Expected Behavior

There is no option to enable --experimental rules with .editorconfig

It would be great to be able to write something like:

[*.{kt,kts}]
indent_size=4
insert_final_newline=true
max_line_length=off
disabled_rules=indent
ktlint_experimental=true

[Tapchicoma]

Related to #548

[Ciatzo]

Would enjoy this too

[romtsn]

Let's track this in #548