Add support of bit shifts on signed integers

[kevaundray]

Problem

The previous code seems to have only done a right shift, if the rhs was a constant. Moreover, it did an unsigned division.

The current code does not handle integer arithmetic, ie overflows etc, so right shifts are doing field divisions instead of integer divisions. This is most likely not the correct route forward.

Happy Case

We should rationalize whether we want shift left and shift right to work only for unsigned integers.

This would mean that both implementation would be doing integer mul and integer division. The previous code was doing Field Mul and integer division.

Alternatives Considered

No response

Additional Context

No response

Would you like to submit a PR for this Issue?

No

Support Needs

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[kevaundray]

Rationale can be written here and we can put it in the code as docs after

[guipublic]

Left and right shift are implemented for non-const unsigned integers in PR #2072
The only missing piece is to have bit shift for signed integers. However it is not worth to implement this as long as signed integers are not fully supported.

[kevaundray]

we have signed integers implemented, so we can close once we have bit shift implemented for them