In this patch we split the serialization routine into two different
routines: `getCLIOptionsValues()` for only serializing the key-value
pairs and `getCLIOptionsInfo()` for getting additional information such
as help text etc. The former is used a lot more frequently than the
latter, which is only used for generating `--help` and building
`process.allowedNodeEnvironmentFlags`.

`getCLIOptionsValues()` also adds `--no-` entries for boolean options so
there is no need to special case in the JS land.
This patch also refactors the option serialization routines to
use v8::Object constructor that takes key-value pairs in one go
to avoid calling Map::Set or Object::Set repeatedly which can go
up to a patched prototype.