Add sorting parameters to Releases API

What does this MR do?

Adds sorting to the ReleaseFinder and the Releases API.

This MR enables the user to be able to make a sorted request to the Releases API by using the sort and order_by parameters.

For example, GET /api/v4/projects/7/releases?sort=asc&order_by=released_at would return releases in ascending order, ordered by their released_at time.

Sorting options in this MR:

sort	order_by
asc	released_at
desc	released_at

sort	order_by
asc	created_at
desc	created_at

The default order is set to released_at desc.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team