IndentBlock should work with config.heading.options

[oleq]

📝 Provide detailed reproduction steps (if any)

ATM block names in the model are hardcoded. If anyone configures different heading element names, the block indent will stop working.

Since ckeditor/ckeditor5-indent#20 delays the initialization of the indent block feature, we can discover heading element names as I mentioned in the PR.

cc @jodator

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[jodator]

As in the PR comments: Yep, the refined code for this looks cool and as long we will not change the heading configuration options API then we will be safe with this change.

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[CKEditorBot]

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