Feature Request: provide "current tagging context"

## Feature Request Form
### Problem you are trying to address with this feature
improved user experience tagging / facilitate re-using tags / reduce repetitive data entry

### Your solution
- Implement the idea of a **current tagging context** as the set of tags which will be inserted on all new notes upon creation.
- Allow (re)setting the **current tagging context** in a few different ways:
- provide a "default current tagging context" for a group
- use the tags from the current note as new **current tagging context**

No files, tests, or entry points are identified, so begin by locating the note-creation and tag-handling areas and clarifying the intended behavior. Done should include applying a current tagging context to new notes, supporting a group default, and allowing tags from the current note to reset that context.

Written by the indexing model from the issue text.