ci: prepare tests for Deno

[wellwelwel]

Improving tests interoperability by using:

• explicit extensions for all test import and require
• explicit import native Node.js features (such as process, buffer, etc.)
• use node: prefix for Node.js native features (e.g., node:process, node:buffer, etc.)
• Use require to import .cjs into .mjs tests

Note

No changes have been made to the main code.

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I'm developing a "polyfill" to allow testing CommonJS with Deno directly.
Here's the MySQL2 spoiler:

131/150

The next step depends on wellwelwel/poku#300.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.32%. Comparing base (8f0320d) to head (5f1a5e4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2711   +/-   ##
=======================================
  Coverage   90.32%   90.32%           
=======================================
  Files          71       71           
  Lines       15729    15729           
  Branches     1341     1342    +1     
=======================================
  Hits        14208    14208           
  Misses       1521     1521           

Flag	Coverage Δ
compression-0	90.32% <ø> (ø)
compression-1	90.32% <ø> (ø)
tls-0	89.85% <ø> (ø)
tls-1	90.13% <ø> (ø)

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