fix: reflection issues with fetch

[sgammon]

Summary

Fixes some reflection issues with fetch, and adds some improved error handling within the CLI; also adds an experimental feature to warm preamble scripts at build time (by parsing their sources statically).

[codecov]

Codecov Report

Attention: Patch coverage is 5.47945% with 69 lines in your changes missing coverage. Please review.

Project coverage is 48.40%. Comparing base (e0d3962) to head (ee32e56).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
...in/elide/runtime/plugins/AbstractLanguagePlugin.kt	0.00%	38 Missing ⚠️
...kotlin/elide/tool/cli/cmd/repl/ToolShellCommand.kt	0.00%	31 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1279      +/-   ##
==========================================
+ Coverage   48.24%   48.40%   +0.16%     
==========================================
  Files         500      500              
  Lines       18295    18365      +70     
  Branches     3236     3265      +29     
==========================================
+ Hits         8826     8890      +64     
- Misses       8441     8462      +21     
+ Partials     1028     1013      -15     

Flag	Coverage Δ
jvm	48.40% <5.47%> (+0.16%)	⬆️
lib	48.40% <5.47%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...main/kotlin/elide/runtime/plugins/js/JavaScript.kt	96.22% <100.00%> (+0.10%)	⬆️
...kotlin/elide/tool/cli/cmd/repl/ToolShellCommand.kt	42.06% <0.00%> (-1.64%)	⬇️
...in/elide/runtime/plugins/AbstractLanguagePlugin.kt	0.00% <0.00%> (ø)

... and 10 files with indirect coverage changes

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