The parser doesn't break the symbols in `*` `&` from the name of
anchors/aliases. So go to definition doesn't work, but highlight of
usage does :D
Test with
```yaml
Defaults: &defaults
Company: foo
Item: 123
Computer:
<<: *defaults
<<: *defaults
Price: 3000
```
Ref https://github.com/nvim-treesitter/nvim-treesitter-refactor/issues/18
Fix https://github.com/nvim-treesitter/nvim-treesitter/issues/887
(block_node) includes more nodes to fold, test with:
```yaml
days:
Monday:
- test: example
Tuesday:
- test: example
Wednesday:
- test: example
- test: example
Thursday:
- test: example
Friday:
- test: example
- foo: |
One
Two
Three
```
