web-tree-sitter - fields not available

[char0n]

This has been reported to tree-sitter-repository as: tree-sitter/tree-sitter#874

Seems like it's possibly fixed. Without having fields we have to maintain complex code that compensates.

• update tree-sitter-toolset to latest versions
• find out if fields are supported and simplify our code (if they are there)

[char0n]

keyNode and valueNode are still not available but fix additional problem with surrogate pairs. Parser now support following cases:

: value

:

[char0n]

Refs: tree-sitter/tree-sitter#964