moves common/time.go to common/dttm/dttm.go, and renames many of the consts and funcs with names that better explain their design and intent of usage. Only code movement, no logical changes. --- #### Does this PR need a docs update or release note? - [x] ⛔ No #### Type of change - [x] 🧹 Tech Debt/Cleanup #### Test Plan - [x] ⚡ Unit test - [x] 💚 E2E