Add API to search for a project using `path_with_namespace`

Problem to solve

To search for a project by name, API we are using now is https://docs.gitlab.com/ee/api/projects.html#search-for-projects-by-name , but it isn't helping in any way. I even tried using using https://gitlab.com/api/v4/projects/?path_with_namespace=gitlab-org/gitlab-ce, but I am not getting any desired result.

Further details

It will be easy to get details of particular project using path_with_namespace, because search isn't giving exact result.

Proposal

Add a method in projects API to get a project using a better parameter path_with_namespace and it should do a full match for it. "GET /projects?path_with_namespace=:namespace"

What does success look like, and how can we measure that?

This feature will be a success if we could get details only of required project, nothing else, output should contain one result or none.

Links / references

/label api