feat: aws-lambda adapter

[OskarLebuda]

Resolves #85

Add new aws-lambda adapter.

import { toLambdaHandler } from "srvx/aws-lambda";

export const handler = toLambdaHandler({
  fetch(req: Request) {
    return Response.json({ hello: "world!" });
  },
});

[codecov]

Codecov Report

❌ Patch coverage is 79.31034% with 36 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/adapters/aws-lambda.ts	2.85%	34 Missing ⚠️
src/adapters/_aws/_utils.ts	98.56%	2 Missing ⚠️

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