Integration of Web UI

[hayk96]

Is your feature request related to a problem? Please describe.
This proposal aims to solve challenges such as managing Prometheus rules (alerting and recording) via text editors, which require reloading (restarting in the worst cases) Prometheus service after each rule change. Considering the enhanced API functionality that the Prometheus API provides, it is fully possible to build a lightweight user interface on top of this proxy application.

Describe the solution you'd like
Create a simple, yet highly functional, user interface using HTML, CSS, and JS on top of the prometheus-api project. It is suggested that this UI be disabled by default because the primary goal of the prometheus-api project is to provide API functionalities.

Describe alternatives you've considered
N/A

Additional context
This functionality will make the development, debugging, and management of production rules processes faster and more flexible while engineers work on their Prometheus rules.