feat: add key min size filter condition

[destinyoooo]

Use the command line to add the -key-size command and filter the results based on the value size: for example:

[root@localhost rdb]# ./target/rdb-linux-amd64 -c memory -o mem.csv examples/decode/example.rdb
[root@localhost rdb]# cat mem.csv
database,key,type,size,size_readable,element_count,encoding,expiration
0,hash,hash,131,131B,2,ziplist,
0,s,string,64,64B,0,string,
0,e,string,88,88B,0,string,2022-02-18T06:15:29+08:00
0,list,list,203,203B,4,quicklist,
0,zset,zset,99,99B,2,ziplist,
0,large,string,2608,2.5K,0,string,
0,set,set,284,284B,2,set,

The execution result of adding -key-size 204 is as follows

[root@localhost rdb]# ./target/rdb-linux-amd64 -c memory -key-size 204 -o mem2.csv examples/decode/example.rdb
[root@localhost rdb]# cat mem2.csv
database,key,type,size,size_readable,element_count,encoding,expiration
0,large,string,2608,2.5K,0,string,
0,set,set,284,284B,2,set,

[destinyoooo]

@HDT3213 Could you take a look? Or whether this is necessary to be merged?