refactor!: Bump minimum supported Node.js version to v16

[hyperupcall]

Short description of what this resolves:

Node.js v16 just hit EOL a few months ago. I saw that Node.js v16 was still in CI, which is even older, so I didn't make v18 the minimum since it seems this repository lags behind.

Let me know if I should make v18 the minimum - that's one less upgrade in the future and less worry about using dependencies that could set their minimums to v18.

Proposed changes:

• Remove Node.js v14 from CI
• Use v16 in "engines" configuration (v16 is already used in .nvmrc)
• Update tsconfig.json to use v16 preset
  • As a result of this (changing module/moduleResolution), some updates to the imports had to be made
• Upgrade to latest TypeScript since we depent on tsconfig.json options of recent TypeScript version
• This is a BREAKING CHANGE and would require a major version update

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.46377% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 97.94%. Comparing base (22c5716) to head (5442446). Report is 9 commits behind head on master.

Additional details and impacted files

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[hyperupcall]

I know this is a big PR, and I haven't contributed to repository before, so I'm not sure if it would be preferred merging this #1369 first, or my smaller MRs like #1370 and #1368

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.