Use tree-sitter as underlining parser

[char0n]

Start implementations with creating standardized AST via stampit specification and continue with transformer of CST -> AST. This will allows us to continue using current babel/graphql inspired traversal mechanism of ours. I'd need to change an architecture of code to reflect the possibility to plug a custom CST -> AST transformers if somebody would like to create a competing implementation using ANTLR4 or other parser generator.

This is direct follow up of https://github.com/swagger-api/oss-planning/issues/132

• implement CST -> AST transformer
• implement error accumulation mechanism
• replace json-ast for tree-sitter
• remove comments support
• error handling
• browser version of build fragments (web-tree-sitter)
• buildable ApiDOM demo build from linking current monorepo packages