[WIP] support function-text-object in TreeSitter

[t9md]

WIP, Very rough state.

For #1095

Get function range of cursor position contained, by checking node.type of node.parent recursively up to rootNode.

TODO

• [x] Precise recognition of function body on inner-function.

• [x] More language suport

  • list of tree-sitter supported grammar by atom.grammars.treeSitterGrammarsById
  • here is the current state.

    
    # TODO
    'source.c',
    'source.cpp',
    'source.ts',
    'source.flow'

  DONE

  'source.js', 'source.python', 'source.shell', 'source.go', 'source.ruby',

  SKIP

  'source.js.regexp', 'text.html.basic', 'text.html.ejs', 'text.html.erb',

• [x] Skip unfoldable inline-function(??) decide don't skip to support variety of style of func declaration
• [x] Start searching from first char of that line where cursor is before first-char
  • Purpose for this is to get method test when cursor is at very beginning of 2nd line.

    class ClassName
    def test
    puts "hello"
    end
    end