Refresh token if it will likely expire before the next validation

[bartmoorman]

This PR resolves 2 issues:

1. Increase _revalidate_all's expires_in check from 300 seconds to 3600 seconds (added a 5 minute buffer) since the time between token validations is 55 minutes.
2. Add an expires_in check to add_token. If the token will expire before the next validation (55 minutes + 5 minute buffer), refresh the token before adding it.

Logs showing changes are working as intended:

2025-03-03 17:16:04,446 DEBUG    twitchio.authentication.tokens Started the token validation loop on ManagedHTTPClient.
2025-03-03 17:16:04,446 DEBUG    twitchio.authentication.tokens Attempting to revalidate all tokens that have passed the timeout on ManagedHTTPClient.
2025-03-03 17:16:04,605 DEBUG    twitchio.authentication.tokens Token expires in 1665 seconds. Attempting to refresh.
2025-03-03 17:16:04,851 INFO     twitchio.authentication.tokens Token successfully added to TokenManager after refresh: "[bot]"
2025-03-03 17:16:04,894 DEBUG    twitchio.authentication.tokens Token successfully added to TokenManager: "[owner]"
2025-03-03 17:17:04,448 DEBUG    twitchio.authentication.tokens Attempting to revalidate all tokens that have passed the timeout on ManagedHTTPClient.
...
2025-03-03 20:02:05,313 DEBUG    twitchio.authentication.tokens Attempting to revalidate all tokens that have passed the timeout on ManagedHTTPClient.
2025-03-03 20:02:05,547 DEBUG    twitchio.authentication.tokens Token for "[owner]" expires in 2033 seconds. Attempting to refresh token.
2025-03-03 20:02:05,757 DEBUG    twitchio.authentication.tokens Token for "[owner]" was successfully refreshed.
2025-03-03 20:03:05,758 DEBUG    twitchio.authentication.tokens Attempting to revalidate all tokens that have passed the timeout on ManagedHTTPClient.
...
2025-03-03 20:57:05,841 DEBUG    twitchio.authentication.tokens Attempting to revalidate all tokens that have passed the timeout on ManagedHTTPClient.
2025-03-03 20:57:06,063 DEBUG    twitchio.authentication.tokens Token for "[bot]" expires in 1746 seconds. Attempting to refresh token.
2025-03-03 20:57:06,266 DEBUG    twitchio.authentication.tokens Token for "[bot]" was successfully refreshed.
2025-03-03 20:58:06,314 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]

I've added some additional logic to the tokens.py file, you will have to validate there is no conflicts with your logic.

[bartmoorman]

I've added some additional logic to the tokens.py file, you will have to validate there is no conflicts with your logic.

Thank you for the heads up. I don't see any logic conflicts between the changes.

[EvieePy]

👍