Add `CurvedMesh` type

[jlchan]

Add a CurvedMesh type to indicate when a MeshData has been created by a curved warping of nodal coordinates.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (pre-0.15@576d693). Click here to learn what that means. The diff coverage is n/a.

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