Make GPUInterpreter extensible

[vchuravy]

Currently Enzyme uses it's own AbstractInterpreter, in particular to handle inlining blocking of functions with custom rules and to handle nested autodiff operations.

• [ ] Create a version of Enzyme with this
• [ ] Support a version of gpuc.deferred(meta)

[vchuravy]

[!WARNING] This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite. Learn more

• #636
• #634 👈
• #633
• #582
• master

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 84.16667% with 19 lines in your changes missing coverage. Please review.

Project coverage is 72.29%. Comparing base (9b54632) to head (1638cc2).

Files with missing lines	Patch %	Lines
src/jlgen.jl	79.12%	19 Missing :warning:

Additional details and impacted files

@@              Coverage Diff               @@
##           vc/plugins     #634      +/-   ##
==============================================
- Coverage       73.68%   72.29%   -1.40%     
==============================================
  Files              24       24              
  Lines            3310     3353      +43     
==============================================
- Hits             2439     2424      -15     
- Misses            871      929      +58     

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