Add process.cwd()

[randomboi404]

It changes the following:

1. Uses a provider pattern so as to allow custom ProcessProvider for embedded systems where using the default StdProcessProvider will not be proper.

2. Adds process.cwd() so as to allow:

./boa
>> process.cwd()
"/root/boa"

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,862	52,862	0
Passed	49,471	49,471	0
Ignored	2,249	2,249	0
Failed	1,142	1,142	0
Panics	0	0	0
Conformance	93.59%	93.59%	0.00%

[codecov]

Codecov Report

❌ Patch coverage is 0% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.50%. Comparing base (6ddc2b4) to head (16067b3).
⚠️ Report is 647 commits behind head on main.

Files with missing lines	Patch %	Lines
core/runtime/src/process/mod.rs	0.00%	23 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4603      +/-   ##
==========================================
+ Coverage   47.24%   56.50%   +9.25%     
==========================================
  Files         476      548      +72     
  Lines       46892    60090   +13198     
==========================================
+ Hits        22154    33952   +11798     
- Misses      24738    26138    +1400     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[jedel1043]

Implementation wise looks great! I just have an API suggestion and a comment on the error thrown when calling current_dir().

[jedel1043]

Looks great! Thank you for the contribution!