Expose API to do manual flushing of cached data

Component(s)

disk-buffering

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

Currently, the disk buffer flushes only based on time, but for use cases such as Android, it would be nice to have a way to shortcut this and do it on demand, like when the app is about to go into the background, which means it could be killed by the OS at any time.

Describe the solution you'd like

An API that basically allows the app to say "cut the batch now and send what has been cached" would be very useful.

Describe alternatives you've considered

No response

Additional context

No response

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