Add createParser methods in ObjectMapper, ObjectReader #18
Description
(similar to #17 but for parsers)
Currently there is no way to create "fully configured" parser that would be suitable for passing to ObjectMapper or ObjectReader, esp. for use cases that involve JsonParser.readValueAs().
Previously (with Jackson 2.x) this could be achieved by passing or (re)setting ObjectCodec, but since that will be removed (see #16) we need replacement.