Add support for `login` command

[Harsh4902]

Reason/Context

• Add support for login command, which will help to perform authentication with microcks instance,

This is a part of #97

Description

• We can add login command to our CLI which will perform a user login and retrieve the credentials.
• It will help to perform upcoming commands seamlessly without getting credentials on every execution.
• It will also help to remove extra flags like microcksURL, keycloakClietnId, keycloakClientSecret from the commands.

Implementation ideas

No response

[Harsh4902]

Screen.Recording.2025-05-11.at.10.51.56.PM.mov

@lbroudoux We have successful implementation of login command 🎉 🥳

[lbroudoux]

What is the authentication you're implementing here? As you are using a "regular" user to login (admin) I would have expected to see the browser-based authentication flow where browser opens on Keycloak authentication flow wnd then redirect on a localhost port where the CLI has started a callback handler...

[Harsh4902]

What is the authentication you're implementing here? As you are using a "regular" user to login (admin) I would have expected to see the browser-based authentication flow where browser opens on Keycloak authentication flow wnd then redirect on a localhost port where the CLI has started a callback handler...

Now we have browser-based login flow 🎉 🥳

Screen.Recording.2025-05-14.at.4.39.16.PM.mov