Support the switch StringTable Split ID feature

desc:

• 
  Hadoop 3.2 introduced optimization features for HDFS StringTable (b60ca37914b22550e3630fa02742d40697decb3), It resulted in lower versions of Hadoop upgraded to 3.2 and later versions not supporting downgrade operations.

• This issue has also been discussed in HDFS-14831, and it is recommended to revert the feature, but it cannot fundamentally solve the problem。
• 
  Therefore, we have added an optimization to support downgrading

Solution:

• First, we will add the "dfs. image. save. splitId. stringTable" conf switch "StringTable optimization feature" is enabled

• When the conf value is false, an Image file compatible with lower versions of HDFS is generated to support downgrading.
• 
  The difference in HDFS Image file format between Hadoop 3.1.1 and Hadoop 3.2 is shown in the following figure.
• With the sub-sections feature introduced in HDFS-14617, Protobuf can support compatible reading.
• 
  The data structure causing incompatible differences is mainly StringTable.

• In "dfs.image.save.splitId.stringTable = false " the Id generation order of StringTable starts from 0 to Integer.Max. When true, the Id value range follows the latest rules.