TryFromJs from JsMap for HashMap & BtreeMap

[Nikita-str]

Seems like TryFromJs didn't convert correctly from JsMap into HashMap / BtreeMap

This PR fix it

Example
Next code

use boa_engine::{value::TryFromJs, Context, JsResult, Source};
use std::collections::HashMap;

fn main() -> JsResult<()> {
    let js_code = "new Map([['a', 2], ['b', 3]])";
    let mut context = Context::default();

    let js_value = context.eval(Source::from_bytes(js_code))?;
    println!("{}", js_value.display());

    let map = HashMap::<String, i32>::try_from_js(&js_value, &mut context)?;
    println!("{map:?}");
    Ok(())
}

before this changes will return:

Map { "a" → 2, "b" → 3 }
{}

and after changes returns:

Map { "a" → 2, "b" → 3 }
{"a": 2, "b": 3}

Notes
I don't find more fast way(than the one used in for_each_elem_in_js_map) to get (key, value)'s from JsMap.
Maybe there is a way?
Or maybe I should write it (for example by function like next but that just return Option<(JsValue, JsValue)>)?

[jedel1043]

Thank you! I have a small suggestion to simplify things.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 52.91%. Comparing base (6ddc2b4) to head (3a8bf86).
Report is 280 commits behind head on main.

Files with missing lines	Patch %	Lines
core/engine/src/builtins/map/mod.rs	58.82%	7 Missing ⚠️
...e/src/value/conversions/try_from_js/collections.rs	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3998      +/-   ##
==========================================
+ Coverage   47.24%   52.91%   +5.66%     
==========================================
  Files         476      483       +7     
  Lines       46892    46893       +1     
==========================================
+ Hits        22154    24813    +2659     
+ Misses      24738    22080    -2658     

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[jedel1043]

Looks great! Thank you!

[nekevss]

This is looking great! Just had a small thought on the function name that I thought might be worth a little bikeshedding.

[nekevss]

Looks great! Thanks for your work on this! 😄