Added warning for clippy:pedantic and clippy::perf. Fixed issues.

[martinfrances107]

What I did :-
add warning
ran cargo clippy --fix
manually inspected the changes .. all ok

The effect is all minor changes

#[must_use]

Improved API design ... users will now be bumped on the nose if they are using the API incorrectly.

Also in some places casting becomes explicit.

-        va[0] as Real + (vb[0] as Real - va[0] as Real) * t,
-        va[1] as Real + (vb[1] as Real - va[1] as Real) * t,
-        va[2] as Real + (vb[2] as Real - va[2] as Real) * t,
+        Real::from(va[0]) + (Real::from(vb[0]) - Real::from(va[0])) * t,
+        Real::from(va[1]) + (Real::from(vb[1]) - Real::from(va[1])) * t,
+        Real::from(va[2]) + (Real::from(vb[2]) - Real::from(va[2])) * t,

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[fslabs-bot]

Welcome @martinfrances107! It looks like this is your first PR to fslabs/PoissonReconstruction 🎉