Feature/649 filter endpoints

Describe the MR

Add a state filter menu in the Endpoints list page.

Screen_Recording_2020-12-11_at_14.11.43

Why was this MR needed?

It allows to filter the list of Endpoints displayed, by state.

Extra-care points?

Does this MR meet the acceptance criteria?

• Documentation created/updated
• CHANGELOG updated
• Unit Tests added/updated

What are the relevant issue numbers?

Closes #649

License and Developer Certificate of Origin

• By contributing to Pantomath SAS, You accept and agree to the following terms and conditions for Your present and future Contributions submitted to Pantomath SAS. Except for the license granted herein to Pantomath SAS and recipients of software distributed by Pantomath SAS, You reserve all right, title, and interest in and to Your Contributions. All Contributions are subject to the following Developer Certificate of Origin and License terms.