Merge tc_infer_hs_type and tc_hs_type into one function using ExpType philosophy (#24299, #23639)

This patch implements refactoring which is a prerequisite to
updating kind checking of type patterns. This is a huge simplification
of the main worker that checks kind of HsType.

It also fixes the issues caused by previous code duplication, e.g.
that we didn't add module finalizers from splices in inference mode.