tracking: Header and Block as a primitive

[neo451]

Like note, link, tag, header and block should have a more rounded implementation

Meta Quetions

• what about hover and workspace_symbols implementations
• in theory blocks should all be unique, but can be duplicated

Header

• nested

• references

  • [[name#header]]
  • [[#header]]
  • [header](#header)

• completion

  • [[#header]]
  • [[name#header]]
  • preserve original case
  • [[##header]]

• definition

  • [[name#header]]
  • [[#header]] Links to a heading to the same note are incorrectly resolved #503
    • col is wrong
  • [header](#header)

Block

• references
  • [[name#^block]]
  • [[#^block]]
  • [header](#^block)
• completion
  • [[#^block]]
  • [[name#^block]]
  • preserve original case
  • [[^^block]]
• definition
  • [[name#^block]]
  • [[#^block]] and [block](#^block) feat: follow block links #511
  • after following blocks, should display the ts node with a flash like on_yank, displaying the block it marked