lexer: add peek() method
lexer: add peek() method

hashicorp/hcl,strivecast/hcl,hashicorp/hcl,fatih/hcl,strivecast/hcl,strivecast/hcl,hashicorp/hcl,savaki/hcl,hashicorp/hcl,strivecast/hcl,strivecast/hcl,hashicorp/hcl,KONTRAKT-DLL/hcl