Add a bundle configuration example

Closes #2

See merge request dbp/middleware/dbp-api/api-starter-bundle!19

This adds one config entry and injects the value into a service when the bundle gets loaded.

See the README changes for how to set the config in the symfony app.

Fixes #2

fix(deps): update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-starter-bundle!17

Install from a fixed branch to avoid it picking a feature branch.
Use composer when adding the dep.
Use the real name in the example commands.

They are public and https is easier to manage for beginners.

fix(deps): update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-starter-bundle!15

fix(deps): update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-starter-bundle!13

fix(deps): update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-starter-bundle!11

fix(deps): update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-starter-bundle!10

chore(deps): update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-starter-bundle!8

The core bundle no longer requires auth by default which means all
API endpoints can be accessed without any token now.

This adds one custom controlle which requires auth as an example.

Also adds some basic tests for all the added endpoints.

Update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-starter-bundle!7

Update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-starter-bundle!5

Update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-starter-bundle!4

Update dependency vimeo/psalm to v4.4.0

See merge request dbp/middleware/dbp-api/api-starter-bundle!3

Update all non-major dependencies

See merge request dbp/middleware/dbp-api/api-starter-bundle!1

See https://github.com/vimeo/psalm/issues/4961