repl: move completion logic to internal module

[dario-piotrowicz]

This PR moves the repl completion logic into its own internal module, my reasoning for proposing this change is that the repl completion logic currently occupies a big chunk of the repl module and it's hard to tell which functions are relevant to it and which are not.

So, also given the fact that the completion logic is pretty self contained, I believe that isolating it will lead to a better, more maintainable and more understandable code structure.

This is also consistent with the repl history which has its own internal module (and also the await module).

Later I am also planning to do other code restructuring/cleanups, but for this PR, in order to make it easy to review I tried to minimize as much as possible code changes and just tried to move things over the new internal completion module. So in this PR I basically only moved code from lib/repl.js to lib/internal/repl/completion.js, with the only exception being that I moved shared logic into the lib/internal/repl/utils.js (and imported it in the other 2 modules).

[codecov]

Codecov Report

❌ Patch coverage is 95.14451% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.30%. Comparing base (c8c6bfa) to head (446cedc).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/repl/completion.js	94.76%	38 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #59889      +/-   ##
==========================================
+ Coverage   88.29%   88.30%   +0.01%     
==========================================
  Files         702      703       +1     
  Lines      206875   206954      +79     
  Branches    39806    39812       +6     
==========================================
+ Hits       182667   182760      +93     
+ Misses      16218    16206      -12     
+ Partials     7990     7988       -2     

Files with missing lines	Coverage Δ
lib/internal/repl/utils.js	96.67% <100.00%> (+0.19%)	⬆️
lib/repl.js	94.12% <100.00%> (-0.15%)	⬇️
lib/internal/repl/completion.js	94.76% <94.76%> (ø)

... and 26 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69245/