Refresh token before it expires

Description

Add scheduled and immediate token refresh handling for Murena accounts

• access_token -> Used to access protected resources. In our case, it has a 1-hour validity.
• refresh_token -> Used to request a new access token once the current one expires. Each refresh token can be used to request up to 10 access tokens. Usually this gets changed in each access token request.
• expires_at -> Absolute timestamp in milliseconds indicating when the access token expires.

Screenshots

Technical details

Tests

Issues

• https://gitlab.e.foundation/e/os/backlog/-/issues/3743
• https://gitlab.e.foundation/e/os/backlog/-/issues/3559

10 commandments of code review

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