Disambiguate private and public RSTRUCT_ helpers

RSTRUCT_LEN / RSTRUCT_GET / RSTRUCT_SET all existing in two
versions, one public that does type and frozens checks
and one private that doesn't.

The problem is that this is error prone because the public version
is always accessible, but the private one require to include
`internal/struct.h`. So you may have some code that rely on the
public version, and later on the private header is included and
changes the behavior.

This already led to introducing a bug in YJIT & ZJIT:
https://github.com/ruby/ruby/pull/15835

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