Reintroduce Lumen support

[stayallive]

Lumen was dropped in #579, but this might have been a little too soon.

So, here it is, back again with support for Laravel 10.x components!

Also a little improved where we should see better transaction names more often hopefully.

This was tested quite quickly so a little more testing would be helpful, you can install this by running the following:

composer require "sentry/sentry-laravel:dev-lumen@dev"

After this you can continue with the docs to register Sentry in your bootstrap/app.php: https://docs.sentry.io/platforms/php/guides/laravel/other-versions/lumen/

Relates: #684.

[cleptric]

Besides the minor update in the README, this looks great!

$router->get('example[/{id}]', 'ExampleController@show');