feat(lua,mods): NPC OMT movement & unload bindings, surv radio

[shmakota]

Purpose of change (The Why)

We need a bunch of hooks for NPC movement on the overmap for it to actually be useful. Also these are requirements for the survivor radio mod.

Describe the solution (The How)

Add bindings for getting, setting, and clearing the omt destination of NPCs, and signaling them to travel there

Also adds bindings for when creatures and NPCs are unloaded.

Describe alternatives you've considered

Testing

Try out the included survivor radio mod.

Additional context

Checklist

Mandatory

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax like closes #1234 in Summary of the PR so it can be closed automatically.
• I've committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

Optional

• This PR adds/removes a mod.
  • I have added mods scope to the PR title.
  • The mod_name in data/mods/<mod_name> matches id in modinfo.json.
  • I have committed the output of deno task semantic.
• This PR modifies lua scripts or the lua API.
  • I have added lua scope to the PR title.
  • I have added type annotations to functions so that it's safe and easy to maintain.

[autofix-ci]

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