misc: Move folly/Hash.h include from Type.h to Type.cpp (#16670)

Summary:
`Type.h` is one of the most widely included headers in the Velox codebase (200+ downstream files). It included `folly/Hash.h`, which expands to preprocessed lines, but `folly::Hash{}` is only used in `Type.cpp`. This PR moves the include to `Type.cpp` where it actually belongs, following the include-what-you-use (IWYU) principle.

  Only 3 other files in the codebase directly include `folly/Hash.h`, so this eliminates ~76K preprocessed lines from ~205 translation units.

  ## Test plan

  - Full debug build passes (no compilation errors) on CI

Pull Request resolved: #16670

Differential Revision: D95972466

Pulled By: peterenescu

fbshipit-source-id: 6ea7eefd297387fd7f5f4534f66416085635a9a8

Author: n0r0shi

velox/type/Type.h

@@ -16,7 +16,6 @@
 #pragma once
 
 #include <folly/CPortability.h>
-#include <folly/Hash.h>
 #include <folly/Random.h>
 #include <folly/container/F14Set.h>
 #include <folly/dynamic.h>