Modernize our TypeScript usage

[benjie]

• Runner gains [Symbol.asyncDispose]() method, so you can
  await using runner = await run(...) and the worker will be released when you
  reach the end of the scope. (Primarily useful for tests.)
• Maintenance work: upgrade to latest TypeScript, Jest, eliminate ts-node, fix
  yargs, use erasable syntax only for type-stripping support, upgrade prettier, fix ESLint config

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​jest/​globals@​26.6.2 ⏵ 30.4.1			+4
	jest@​26.6.3 ⏵ 30.4.2			+2
	@​tsconfig/​node20@​20.1.9
	jest-time-helpers@​0.1.1 ⏵ 1.1.1-canary.1	+3		+1	+11
	@​tsconfig/​node-ts@​23.6.4
	@​types/​jest@​26.0.24 ⏵ 30.0.0	+1
	typescript@​5.2.2 ⏵ 5.9.3
	eslint-plugin-jest@​26.9.0 ⏵ 29.15.2			+1	+1
	ts-jest@​26.5.6 ⏵ 29.4.11			+1
	prettier@​2.8.8 ⏵ 3.8.3	+2

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