[Features req] the support of dynamically calculating bfaa / ftaa / tta

[fwilliamhe]

Here is my recent result about the authentication system of codeforces. I think it will be help.

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[tiger2005]

Thanks for your advice. Maybe I will add them these days.

[tiger2005]

目前正在计划推出 CCHv3，这些问题也将会在下一个大版本（另一个 repo）后解决。