Improve tag search

[riccardoferretti]

As discussed in #1285

Improve the search for tags over the simple VS Code text search, in order to include also tags defined in YAML.

^{Originally posted by serifold September 14, 2023}
For ordinary tags, e.g. #tag1, I know they can be found by search the keyword #tag1. However, if I have some tags in YAML front matter, e.g.

---
tags: tag1 tag2
---

I can't find them by searching such as #tag1. If I change tags: tag1 tag2 to tags: #tag1 #tag2, then Foam won't recognize them as tags.

Is there something wrong the way I use tags in YAML front matter? If not, could we add a search button in the Tag Explorer bar, which can search all tags? Or just add a command such as Foam: Search tags that can treat YAML tags correctly.

[dstengle]

I would definitely like to see tag completion in front-matter. I usually put a # to get completion and then remove it.