Add possibility to exclude files from minification

[mkusz]

Feature description

Add the possibility to exclude files from minification both globally and per each of the supported file types.

Project plugin

• [ ] pub-blog
• [ ] pub-debugger
• [ ] pub-meta
• [X] pub-minifier
• [ ] pub-obsidian
• [ ] pub-social
• [ ] a new plugin
• [ ] external plugin integration