feat: add random.string function to eldritch

[flemingcaleb]

What type of PR is this?

/kind documentation
/kind feature
/kind eldritch-function

What this PR does / why we need it:

Adds random.string(uint) to eldritch to allow tome developers to generate random strings.

Which issue(s) this PR fixes:

N/A

[hulto]

Great first PR!
Stoked to add this function will open up a lot of functionality 🤌

Couple of thoughts - happy to chat if you have any questions.

Really great job 👏

[hulto]

Can you add an optional parameter to define the characters the function can draw from.

You can use the Option<Vec>
To achieve this.
An example of the option parameter in use can found in the process.info function.

realm/implants/lib/eldritch/src/process/info_impl.rs

Line 11 in a0904a7

pub fn info(starlark_heap: &Heap, pid: Option<usize>) -> Result<Dict> {

[hulto]

Or maybe a String instead of Vec might be more ergonomic

[hulto]

Also please add the default character set it will use.

[flemingcaleb]

Option added and documentation updated 😄

[hulto]

This seems okay.
I noticed in the bool impl the rng is initialized separately.

let mut rng = rand_chacha::ChaCha20Rng::from_entropy();

Is there a reason to do it one way or another?

[flemingcaleb]

I'm by no means an expert, but this documentation made me think that using the thread_rng is more secure since it re-seeded? I don't have a strong preference either way though and am happy to change if that is the preferred implementation

[hulto]

Oh one last ask please validate that no compiler warnings are generated when building for debug or release

[flemingcaleb]

Confirmed that debug and release build without warnings with the stable-aarch64-apple-darwin toolchain. Trying to get the cross compile to x86 working but am having some troubles with getting the toolchain happy