Consistency for math helpers (isPow2, log2Ceil, etc.)

### Motivation

There are multiple places across ROHD and ROHD-HCL where public and private implementations of some common math operations are included.

For example:
- `LogicValue` has `clog2`
- `FiniteStateMachine` has a private `_logBase` function
- ROHD-HCL's "ecc.dart" has `_isPowerOfTwo`
- ROHD-HCL's `log2Ceil`

Perhaps there are more!

Chisel, for reference, has these built-in math helpers:
https://users.cs.duke.edu/~lkw34/Chisel-Cheatsheet.pdf
- `log2Ceil`
- `log2Floor`
- `isPow2`

### Desired solution

Determine a set of useful mathematical operations and implement them in a way that could be useful in as many ways as possible. Important to consider is that these should be applicable to `int`, `LogicValue`, and even maybe `BigInt`. The APIs should all be located in one package, ideally (instead of spread between ROHD and ROHD-HCL). Old ones should be deprecated (or removed, if private).

### Alternatives considered

_No response_

### Additional details

_No response_