Refresh tokens before they expire

[bartmoorman]

Description

ManagedHTTPClient periodically checks the validity of all managed tokens and refreshes any that have expired. This change preemptively refreshes tokens that would expire before the next validation.

Resolution for: TwitchIO v3 (view)

Example output:

2025-03-02 02:06:08,948 DEBUG    twitchio.authentication.tokens Token successfully added to TokenManager: "[redacted]"
2025-03-02 02:07:08,793 DEBUG    twitchio.authentication.tokens Attempting to revalidate all tokens that have passed the timeout on ManagedHTTPClient.
...
2025-03-02 05:53:45,330 DEBUG    twitchio.authentication.tokens Attempting to revalidate all tokens that have passed the timeout on ManagedHTTPClient.
2025-03-02 05:53:45,521 DEBUG    twitchio.authentication.tokens Token for "[redacted]" expires in 20 seconds. Attempting to refresh token.
2025-03-02 05:53:45,722 DEBUG    twitchio.authentication.tokens Token for "[redacted]" was successfully refreshed.
2025-03-02 05:54:45,722 DEBUG    twitchio.authentication.tokens Attempting to revalidate all tokens that have passed the timeout on ManagedHTTPClient.
...
2025-03-02 10:01:33,820 DEBUG    twitchio.authentication.tokens Attempting to revalidate all tokens that have passed the timeout on ManagedHTTPClient.
2025-03-02 10:01:34,007 DEBUG    twitchio.authentication.tokens Token for "[redacted]" expires in 43 seconds. Attempting to refresh token.
2025-03-02 10:01:34,205 DEBUG    twitchio.authentication.tokens Token for "[redacted]" was successfully refreshed.
2025-03-02 10:02:34,250 DEBUG    twitchio.authentication.tokens Attempting to revalidate all tokens that have passed the timeout on ManagedHTTPClient.

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
  • I have updated the changelog with a quick recap of my changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)
• I have read and agree to the Developer Certificate of Origin for this contribution

[EvieePy]

Since you are accessing some of these values from the dict more than once now you can likely assign them to variables before the try/except.

[bartmoorman]

Done. :)