[CXX-1455] Add JSON-like syntax to construct BSON object - MongoDB Jira

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Today in mongo-cxx-driver, there are several ways of constructing a BSON object
http://mongodb.github.io/mongo-cxx-driver/mongocxx-v3/working-with-bson/

None of them provides a JSON-like way despite the fact it exists generally to construct JSON documents
https://github.com/nlohmann/json

I propose to use a similar construction to build BSON documents. Then, we will be able to write:

document friends {{"friend",{{"_id", json::id{}},

                                             {"name","jean"},

                                             {"dob",1970}}}};

instead of

bsoncxx::document::value = document{} << "friends" << open_document

                                                                                    << "_id" << bsoncxx::oid()

                                                                                    << "name" << "jean"

                                                                                    << " dob" << 1970

                                                                                    << close_document

                                                                                    << finalize;

I started the development of it

depends on

CXX-2067 Expose bson_value::value type constructors

is duplicated by

CXX-1137 Alternative interface via nlohmann/json

CXX-1294 Add new free functions to assist in efficient subdocument/subarray building with the basic builder

is related to

CXX-1137 Alternative interface via nlohmann/json