Update node version to 18.X to fix ky universal build issues

[onnimonni]

Context

This PR builds on top of #568. That PR should be merged first so that we get smaller overall changes.

Root cause

After @transitive-bullshit replaced got for ky #394 our builds broke down with following issue:

Error: R] Could not resolve "ky-universal"

    src/notion-api-universal.ts:2:7:
      2 │ import 'ky-universal'
        ╵        ~~~~~~~~~~~~~~

  You can mark the path "ky-universal" as external to exclude it from the bundle, which will remove this error.

I noticed that the ky-universal is not needed anymore if we update ky to 1.0.0 and nodejs to version 18.X version.

Consequences and why we need to add tsimp

After I upgraded them our tests started to fail in all packages:

lerna ERR! yarn run test exited 1 in 'notion-compat'
lerna ERR! yarn run test stdout:
$ ava

  Uncaught exception in src/notion-compat-api.test.ts

  TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /Users/onnimonni/Projects/react-notion-x/packages/notion-compat/src/notion-compat-api.test.ts

  ✖ src/notion-compat-api.test.ts exited with a non-zero exit code: 1
  ─

  1 uncaught exception
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
lerna ERR! yarn run test stderr:
error Command failed with exit code 1.
lerna ERR! yarn run test exited 1 in 'notion-compat'

I wasn't able to figure out this on my own but I was using the cursor editor and it suggested adding tsimp as loader for ava and then the tests started to work.

We can't use the latest version of tsimp so it's pinned to 2.0.11.
It can be updated when we get node 18 support.

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[transitive-bullshit]

Fixed in #571