Route schema validation

[Pietrohl]

Checklist

• I have ensured my pull request is not behind the main or master branch of the original repository.
• I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
• I have written a commit message that passes commitlint linting.
• I have ensured that my code changes pass linting tests.
• I have ensured that my code changes pass unit tests.
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Validation Schema to routes verb methods

This PR is to resolve the issue 170 for a possible new feature, to add a function overload to route[verb] function so it can accept a schema validation as second parameter.

Example usage:

    const app = new Koa();
    const router = new Router();

    const schema = {
      type: 'object',
      properties: {
        x: { type: 'integer' }
      },
      required: ['x'],
      additionalProperties: false
    };

    router.post('/user', { body: schema }, function (ctx, next) {
      ctx.status = 201;
      ctx.body = { message: 'User added!' };
      }
    );

[socket-security]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Packages	Version	New capabilities	Transitives	Size	Publisher
@koa/bodyparser	5.0.0	None	+7	473 kB	fengmk2