Support meta commands

[lixuanbin]

Memcached offered meta commands since version 1.6, any plan to implement this?

[TysonAndre]

https://github.com/memcached/memcached/wiki/MetaCommands#memcached-text-protocol-meta-commands as of 2021, it's also no longer experimental (I'd been looking into this for different memcached clients)

NOTE: These commands are new. Please let us know if you run into any trouble with the API or the documentation! The meta protocol is no longer considered experimental, please give it a shot!

[QuangTung97]

May be you should try my implementation of memcache client:
https://github.com/QuangTung97/go-memcache
It uses TCP Pipelining & Batching + Connection Round Robin to connect to the memcached server.
It support mostly Meta Commands but missing some features, e.g memcached flags

Sorry for the currently poor documentation, but examples are in the test files:
https://github.com/QuangTung97/go-memcache/blob/master/memcache/pipeline_test.go#L80

Please share with me the results if you do benchmarking