Create a common base feature for mentions, merge tags and slash commands

[Dumluregn]

📝 Provide a description of the new feature

Currently implementing the mentions-like insertion requires hacking the mentions feature (e.g. overriding the mention command execution). There should be a common base feature, which would be used by the more specialized ones according to their needs. Such an approach was used in CKE4 (the mentions plugin was built on top of the autocomplete one: https://github.com/ckeditor/ckeditor4/blob/master/plugins/mentions/plugin.js#L18-L33).

The component should detect conflicting patterns (e.g. { and {{).

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