Improve state change tracking in Meditor

[jjnesbitt]

Currently, in order to track changes in the meditor, we use the key of the "transaction number":

dandi-archive/web/src/components/Meditor/Meditor.vue

Lines 189 to 192 in 44937f9

	<v-jsf
	:key="`
	basicModel-${editorInterface.transactionTracker.getTransactionPointer()}
	`"

However, this usage sort of masks an underlying problem, which is that state change in EditorInterface and MeditorTransactionTracker isn't handled in a very reactive way. For example, updating the basic model is done here:

dandi-archive/web/src/components/Meditor/editor.ts

Lines 86 to 90 in 44937f9

	setBasicModel(newModel: DandiModel) {
	Object.entries(newModel).forEach(([key, value]) => {
	this.basicModel.value[key] = value;
	});
	}

Even though basicModel is a ref that could propagate reactive change. When attempting to simply make that change locally, other things break. I think EditorInterface and TransactionTracker need to be refactored altogether, potentially making use of pinia.