implement support for current_scope

[aviatesk]

No description provided.

[Keno]

Seems reasonable, but it feels like there needs to be something that actually reflects the shadow copy of the current scope here into the runtime upon calling a native function. Not sure if that's here or in Debugger.jl

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (580b95c) 85.64% compared to head (2d026eb) 85.38%.

❗ Current head 2d026eb differs from pull request most recent head 9ce455e. Consider uploading reports for the commit 9ce455e to get more accurate results

Files	Patch %	Lines
src/builtins.jl	30.00%	7 Missing ⚠️
src/interpret.jl	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #605      +/-   ##
==========================================
- Coverage   85.64%   85.38%   -0.26%     
==========================================
  Files          12       12              
  Lines        2515     2525      +10     
==========================================
+ Hits         2154     2156       +2     
- Misses        361      369       +8     

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[aviatesk]

This PR impacts the nightly CI only, although the nightly CI are all failing due to unrelated issues to this PR, primarily due to issues #610 and possibly #591.
Despite the failures, the tests added in this PR have been successfully executed on my local nightly build. Considering this PR also resolves the Check builtins.jl CI issue, I'd like to move forward with it.