Support for comparison of bignums

### Problem

I want to compare 2 bignums

### Happy Case

I can compare 2 bignums. Implement `std::cmp::Ord` for `BigNum`

### Workaround

None

### Workaround Description

_No response_

### Additional Context

_No response_

### Project Impact

None

### Blocker Context

_No response_

### Would you like to submit a PR for this Issue?

None

### Support Needs

_No response_