feat(thirdparty): use official rocksdb

[acelyc111]

https://github.com/apache/incubator-pegasus/issues/1047

For some historical reasons, we use the Xiaomi modified rocksdb library, since Pegasus 2.1.0, we have removed all modifications on rocksdb, only left some code to keep compatiable [1], now before 2.4.0 releasing, it's a chance to switch to the official version.

It's expect that rdsn/thirdparty/rocksdb_fix_atomic_flush_0879c240.patch must be corresponding to this patch [2].

ATTENTION: There is a limit that the server must be upgraded from 2.1, 2.2 or 2.3, to ensure that there is no Pegasus introduced tags which the official rocksdb doesn't recognize left in MANIFEST file.

1. https://github.com/XiaoMi/pegasus-rocksdb/commits/v6.6.4-compatible
2. https://github.com/XiaoMi/pegasus-rocksdb/commit/ef29819c7a1ea9334ae170f506b653757f517a52

[levy5307]

hope block merge before release 2.4

Better to convert it to draft :)

[acelyc111]

hope block merge before release 2.4

@foreverneverer Since we have created an separete branch v2.4 for releasing 2.4.0, so could we continue this work?