Replace `UniformRand` by `CryptoRng + R`

## Summary

`UniformRand` can be replaced by the providers in `rand` to reduce code complexity

## Problem Definition

The base field types need to implement `Standard: Distribution` as RNG requirement. Example:

https://github.com/arkworks-rs/algebra/blob/master/ec/src/models/short_weierstrass_jacobian.rs#L351-L363

This is superseded by [CryptoRng](https://rust-random.github.io/rand/rand/trait.CryptoRng.html) that wraps cryptographic requirements without requiring concrete implementations in `T`.

## Proposal

- [ ] Replace `UniformRand` by `RngCore + CryptoRng`
- [ ] Deprecate `UniformRand`

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#### For Admin Use

- [ ] Not duplicate issue
- [ ] Appropriate labels applied
- [ ] Appropriate contributors tagged
- [ ] Contributor assigned/self-assigned

Start with the referenced ec/src/models/short_weierstrass_jacobian.rs example, then locate the UniformRand definition and its uses in this repository. Review the rand CryptoRng and RngCore requirements and determine the scope of the deprecation. Done means the proposal checklist is addressed and the affected tests pass.

Written by the indexing model from the issue text.