feat: add batch put command

[rfyiamcool]

change

add batch put command. 😁

[akrylysov]

Thanks for the contribution. Is it just some syntactic sugar for the existing Put? This implementation doesn't improve the performance, you save a bit on acquiring the mutex only once per batch, but on the other hand it may cause issues for reads if the mutex is held for too long when inserting a large number of keys.

[rfyiamcool]

Thanks for the contribution. Is it just some syntactic sugar for the existing Put? This implementation doesn't improve the performance, you save a bit on acquiring the mutex only once per batch, but on the other hand it may cause issues for reads if the mutex is held for too long when inserting a large number of keys.

Just to reduce the lock time. 😅 In local kv read/write case, this optimization seems to have no other benefits.