Add pattern option: {{FileNameSlug}}

[jzr-supove]

Would be great if you add new pattern something like {{FileNameSlug}}

When selected, it will rename pasted images like this:

File name: "Obsidian Plugin Test File.md"

Pasted image becomes: "obsidian_plugin_test_file.png"

Could support various naming options:

• "obsidian_plugin_test_file.png"
• "Obsidian_Plugin_Test_File.png"
• "obsidian-plugin-test-file.png"
• "Obsidian-Plugin-Test-File.png"

[robsonsobral]

To slugify the filenames would be amazing!