Refactor: move type singleton logic into type.cc/h and tests #46616
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Rationale for this change
This PR addresses the feedback provided in issue [ #46531 ] (#46531), refactoring the singleton logic to follow the project's file organization conventions.
What changes are included in this PR?
Moved the singleton declaration to type.h
Moved the singleton definition to type.cc
Moved the corresponding test to type_test.cc
Are these changes tested?
✅ Yes, tests are included in type_test.cc.
Are there any user-facing changes?
❌ No, there are no user-facing or breaking changes in this PR.