feat(core): Expose ctx.playerID in onMove hook

[pardahlman]

This PR closes #1018 by adding playerID to the ctx used in the onMove hook.

When setting up my local environment, some tests failed on main - it looks like it is related to TypeScript, api.ts and possibly koa somehow 🤔 Attaching example output from a failed test

 FAIL  src/server/index.test.ts
  ● Test suite failed to run

    src/server/api.ts:151:28 - error TS2339: Property 'toLowerCase' does not exist on type 'string | string[]'.
      Property 'toLowerCase' does not exist on type 'string[]'.

In order to create this PR, I pushed the branch with --no-verify, hence the WIP prefix 😬

Checklist

• [x ] Use a separate branch in your local repo (not main).
• [ x] Test coverage is 100% (or you have a story for why it's ok).

[delucis]

Looks good to me!

(That TS error is definitely not related to these changes. I’m guessing somehow you overrode the package-lock and installed a more recent version of @types/koa, which now types query.)