refactor(Time): add manifold structure and remove TimeTransMan

[RaunakChhatwal]

Give Time a manifold structure in Time/Basic.lean

This enables calculus on Time without having to choose an arbitrary origin point first. The context is I would like to require reference frame origin and basis to be twice differentiable.

Remove TimeTransMan

This resolves the TODO I had previously put on TimeTransMan.

TODO "Remove TimeTransMan in favor of affine Time."

Its root import, API-map entries, lint exemption, and references in TimeUnit documentation are also removed.

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[jstoobysmith]

Approved, and this looks good to me. Many thanks. We'll merge shortly.