feat(types): allow passing interfaces as Bindings / Variables

[ottomated]

This changes the type of Bindings and Variables from Record<string, unknown> to object.

Pro:

• Allows interfaces to be used like so:

interface Env {
  KV: KVNamespace;
}
// would error before
const app = new Hono<{ Bindings: Env }>();

Con:

• Looser type - any non-primitive could hypothetically be passed in

// no error
const app = new Hono<{ Bindings: string[] }>();

In my opinion, this trade-off is worth it because Cloudflare's wrangler types command generates output like this:

// Generated by Wrangler
// After adding bindings to `wrangler.toml`, regenerate this interface via `npm run cf-typegen`
interface Env {
  KV: KVNamespace;
}

Fixes #2981

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.18%. Comparing base (9987b59) to head (3b753d8).

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3136   +/-   ##
=======================================
  Coverage   96.18%   96.18%           
=======================================
  Files         151      151           
  Lines       15030    15034    +4     
  Branches     2646     2736   +90     
=======================================
+ Hits        14456    14460    +4     
  Misses        574      574           

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[yusukebe]

Hi @ottomated !

I've updated your branch to follow the next branch for the next minor release v4.5.0. I'll merge this now. Thank you for your contribution!