Add support to recaptcha.google.cn domain name

[neoblackxt]

Is your feature request related to a problem? Please describe.

buster not work on 52pojie.cn, this website uses a different reCAPTCHA domain name recaptcha.google.cn, html code like this:

<iframe 
title="reCAPTCHA" width="304" height="78" role="presentation" name="a-u7e9sb2093u7" frameborder="0" scrolling="no" sandbox="allow-forms allow-popups allow-same-origin allow-scripts allow-top-navigation allow-modals allow-popups-to-escape-sandbox allow-storage-access-by-user-activation" 
src="https://recaptcha.google.cn/recaptcha/api2/anchor?ar=1&amp;k=6LftSMEUAAAAANe9O4IJt4lDNV2naDxJwOu88w5o&amp;co=aHR0cHM6Ly93d3cuNTJwb2ppZS5jbjo0NDM.&amp;hl=zh-CN&amp;v=EGO3I7Q26cZ-jBw3BEtzIx7-&amp;size=normal&amp;cb=iacv51rwocgs">
</iframe>

Describe the solution you'd like

Add new trigger conditions, such as
https://recaptcha.google.cn/recaptcha/api2/anchor*
https://recaptcha.google.cn/recaptcha/api2/bframe*
https://recaptcha.google.cn/recaptcha/enterprise/anchor*
https://recaptcha.google.cn/recaptcha/enterprise/bframe*
Describe alternatives you've considered

Additional context