feat: admin gc (#308)
* feat: add gc admin rpc * chore: make all Signed-off-by: discord9 <discord9@163.com> * per review Signed-off-by: discord9 <discord9@163.com> * chore: per review Signed-off-by: discord9 <discord9@163.com> --------- Signed-off-by: discord9 <discord9@163.com>
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