Switch from esm to @httptoolkit/esm

[pimterry]

Fixes #37. I've just reused the @types/esm types here, since they should be the same and I haven't worked out how to modify esm to add them in easily directly over there (the build & publish setup is much more complicated than you'd expect).

This change also removes workarounds here that I think were since fixed within esm-wallaby (here and here specifically).

I don't have any specific interesting test cases to confirm those, but I can do things like require('.')('node:fs') with no problem, and everything works correctly for other modules, so I assume that's all working nicely now.

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9502085) 100.00% compared to head (1ee105d) 97.72%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #38      +/-   ##
===========================================
- Coverage   100.00%   97.72%   -2.28%     
===========================================
  Files            4        4              
  Lines           45       44       -1     
  Branches         7        7              
===========================================
- Hits            45       43       -2     
- Misses           0        1       +1     

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[nktnet1]

Looks good to me - thanks @pimterry!