build: modern stack

[termontwouter]

Given that official support for Node.js 14 and 16 has past (their respective end-of-life dates were April 30th and September 11th 2023), I propose we drop support for them in the Components.js stack. Moving to Node.js 18 brings a number of relevant advantages:

• (Finally) stable ESM support!
• (Experimental) integrated fetch API!
• Support for Yarn 4, which brings us:
  • Full integration with Node.js CorePack
  • Automatic management of @types/... packages.
  • Support for (unasserted) JSON modules
  • ESM loaders

Note: I first did a bump to Node.js 16 (with Yarn 3). Should we still want to support that version longer, the last commit can be reverted.

[coveralls]

Pull Request Test Coverage Report for Build 6988768782

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 6978448173:	0.0%
Covered Lines:	1365
Relevant Lines:	1365

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💛 - Coveralls

[rubensworks]

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