STR-722: refactor random generation to CryptoRngCore

[AaronFeickert]

Description

This PR refactors the trait bound CryptoRng + RngCore to CryptoRngCore from rand_core and performs associated import cleanup.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature/Enhancement (non-breaking change which adds functionality or enhances an existing one)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactor
• New or updated tests
• Dependency Update

Notes to Reviewers

None.

Checklist

• I have performed a self-review of my code.
• I have commented my code where necessary.
• I have updated the documentation if needed.
• My changes do not introduce new warnings.
• I have added tests that prove my changes are effective or that my feature works.
• New and existing tests pass with my changes.

Related Issues

None.

[storopoli]

The idea is to break up STR-722 into small easy-to-review PRs?
Then in the final one remove rand altogether for rand_core?

[AaronFeickert]

The idea is to break up STR-722 into small easy-to-review PRs? Then in the final one remove rand altogether for rand_core?

The primary goal is to use CryptoRngCore instead of CryptoRng + RngCore to reduce the likelihood of missing CryptoRng. However, CryptoRngCore is only provided by rand_core, whereas CryptoRng and RngCore are also provided by rand. With a few small extra import updates, it happened to be possible to swap out rand for rand_core as a dependency in a couple of crates, so I went ahead and did that to clean things up a bit.

There are a few places where we really do need rand to get access to sampling and shuffling, so it will stick around. Initially, I went a bit wild with swapping out to rand_core, but realized that's out of scope here and not the intent of the issue.

[storopoli]

ACK 4605cf3

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Project coverage is 56.67%. Comparing base (0011f19) to head (4605cf3).

Files with missing lines	Patch %	Lines
bin/strata-cli/src/cmd/faucet.rs	0.00%	3 Missing ⚠️
bin/datatool/src/util.rs	0.00%	1 Missing ⚠️

@@            Coverage Diff             @@
##             main     #539      +/-   ##
==========================================
+ Coverage   56.56%   56.67%   +0.11%     
==========================================
  Files         303      303              
  Lines       30999    31001       +2     
==========================================
+ Hits        17534    17571      +37     
+ Misses      13465    13430      -35     

Files with missing lines	Coverage Δ
bin/datatool/src/args.rs	0.00% <ø> (ø)
bin/datatool/src/main.rs	0.00% <ø> (ø)
bin/strata-cli/src/cmd/change_pwd.rs	0.00% <ø> (ø)
bin/strata-cli/src/recovery.rs	0.00% <ø> (ø)
bin/strata-cli/src/seed.rs	57.20% <100.00%> (ø)
crates/test-utils/src/lib.rs	87.50% <100.00%> (ø)
bin/datatool/src/util.rs	0.00% <0.00%> (ø)
bin/strata-cli/src/cmd/faucet.rs	0.00% <0.00%> (ø)

... and 4 files with indirect coverage changes