Rename spec_helper and allow using the debugger with bin/dev

[elia]

Summary

• Rename the spec helper so that it has _spec_helper.rb as a suffix for consistencies with extensions.
• Allow remote rdbg debugging when using bin/dev

Checklist

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[codecov-commenter]

Codecov Report

Merging #327 (d8d1752) into main (56fc608) will decrease coverage by 56.72%. The diff coverage is 0.00%.

:exclamation: Current head d8d1752 differs from pull request most recent head bc3f3f2. Consider uploading reports for the commit bc3f3f2 to get more accurate results

@@            Coverage Diff             @@
##             main    #327       +/-   ##
==========================================
- Coverage   56.71%   0.00%   -56.72%     
==========================================
  Files         139     252      +113     
  Lines        2664    5831     +3167     
==========================================
- Hits         1511       0     -1511     
- Misses       1153    5831     +4678     

Impacted Files	Coverage Δ
coverage.rb	0.00% <0.00%> (ø)
template.rb	0.00% <0.00%> (ø)

... and 389 files with indirect coverage changes

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