Ocaml_protoc_compiler_lib.Pb_parsingParsing compilation step
This module perform the parsing of the given protobuf file along with all the imported files.
Given a file name return the fully qualified file name along with its content
val parse_file : file_loader -> string -> Pb_parsing_parse_tree.proto listparse_file file_loader file_name reutrns the protobuf parse tree of the given file_name and all its dependent files (ie imports).