Improve cmake routine for nodejs/http-parser. (#3283)

* Improve cmake routine for nodejs/http-parser. Now it is installed as a
propper target and can be searched with `find_package(http-parser REQUIRED)` and then used as
a dependency like this: `target_link_libraries(main PRIVATE
nodejs::http_parser)`. Also using namespace for referencing http-parser
lib, which is safer, although the old name must still work, as names of
the binaries remained unchanged.

* Remove duplicate variable definition and add newlines at the end of files.

* [http-parser] Rename exported targets to "unofficial", since they are not blessed by upstream

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