Split `common/include/pcl/impl/point_types.hpp`

[kunaltyagi]

This 2400 line file is trouble. Maybe if we can make some things point independent then we can add some to type_traits.h since that's what it is from this point onward.

Note: It's important that type_traits.h is type independent.

Derived from a post by @kunaltyagi in #3899_

[stale]

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