Pass values by reference instead of clone

[mortendahl]

Kernel functions currently take ownership of Values, which means we clone these every time they are sent between operations. This is wasteful in several ways:

• if a value is only flowing to a single operation so ownership could simply be moved
• operators do not generally mutate their inputs and would work just as well with borrowed values
• certain operators, such as HostRorateRightOp and HostIndexAxisOp, are inherently just projecting their inputs

A likely solution to all three would be to pass Arcs around instead, which can already be freely shared between tasks. Note that there are also specialized structs, such as ndarray::ArcArray, that we could consider using directly. It would also be interesting to consider support for passing around ndarray::ArrayView for projections.

[mortendahl]

cc @voronaam just to make you aware about this one; some of the ops in https://github.com/tf-encrypted/runtime/pull/508 would likely benefit non-trivially from this since a lot of projection operations are being used

[mortendahl]

This was mostly done for AsyncSession and SyncSession by switching to ArcArray, but something similar could be done for SymbolicSession to potentially reduce Moose compilation time