build: switch to vite, vitest and api-extractor; add esm output

[fnlctrl]

Build tools simpification

• Use vite for bundling cjs and esm ouput
• Use vitest for testing & coverage report
  • TS is supported out of the box so ts-node is no longer necessary
  • Native v8 instrumentation is used for coverage, so nyc is no longer necessary
• Use api-extractor for .d.ts rollup

Minor changes

• Replace TS namespace as plain object TS it self is migrating away from namespaces. Since it's considered a legacy feature and not part of ES spec, it's better to migrate away too.
• Change require to import