Support for nested bulleted and numbered lists in Markdown syntax

[porg]

• Support bulleted & numbered lists in messages #5027
  • ✅ Was implemented. → 💡 Under "Optional Behavior" it said:

  A nice-to-have is nested lists (for both numbered and bulleted lists).

My feature request is to support exactly that. See the samples below.

User Need: In my peers' daily communication we often need nested lists for TODOs, hierarchical content, etc.

• Having only flat lists poses a limitation all too often.
• Would be a great UX improvement!

Samples

Markdown Nested Bullet List

• Fruit
  • Citrus fruit
    • Lemon
    • Orange
  • Orchard fruit
    • Apple
    • Pear
• Vegetable
  • Leafy green
    • Lettuce
    • Spinach
  • Root vegetable
    • Beet
    • Carrot

Markdown Nested Numbered List

1. Fruit
   1. Citrus fruit
      1. Lemon
      2. Orange
   2. Orchard fruit
      1. Apple
      2. Pear
2. Vegetable
   1. Leafy green
      1. Lettuce
      2. Spinach
   2. Root vegetable
      1. Beet
      2. Carrot