feat: improve access to tags

[ilandikov]

Types of changes

Done by pairing with @claremacrae

• tasksFile.tags
• tasksFile.frontmatter.tags
• ability to test Obsidian functions getAllTags() and parseFrontMatterTags()

Changes visible to users:

• New feature (prefix: feat - non-breaking change which adds functionality)
  • Issue/discussion: Filter Tasks by Properties Frontmatter #2480

Internal changes:

• Refactor (prefix: refactor - non-breaking change which only improves the design or structure of existing code, and making no changes to its external behaviour)
• Tests (prefix: test - additions and improvements to unit tests and the smoke tests)

Description

Motivation and Context

• provide access to filter by YAML tags

How has this been tested?

• new unit tests

Checklist

• My code follows the code style of this project and passes yarn run lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
  • to be done later
• My change has adequate Unit Test coverage.

Terms

• My contribution follows this project's contributing guide
• I agree to follow this project's Code of Conduct