Feat (NoteService): Implement getNoteTitle() method

[e11sy]

Story

In some cases frontend part needs just note title to display iniformation about note
e. g. in home page we can see only noteTitles of the each note, for that case we do not need to pass whole noteContent as we do, we could just pass noteTitles

You can check reference of the method in notes.web repo

Problem

In some cases we do not need whole note content, but we need note title which can be formed only in web part

Steps

• Add getNoteTitle() method for NoteService
• Add NoteTitle and (NotePreview or NoteMeta) entities
  NoteTitle is string
  NoteMeta is actual note, with NoteTitle instead of content
• Check, where we use getNoteTitle() method on the WEB part