[IOTDB-1068] Fix Time series metadata cache bug

[JackieTien97]

Currently, we add the entry size each time we put it into cache map. However, if the key already exists in cache, we will add the size again which will cause the cache used size is higher than the actual size.

Also, in this PR, I improve the process of deserializing time series metadata cache from disk.

[qiaojialin]

Add a test

[sonarqubecloud]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities
0 Security Hotspots
3 Code Smells

No Coverage information
12.3% Duplication

The version of Java (1.8.0_252) you have used to run this analysis is deprecated and we will stop accepting it soon. Please update to at least Java 11.
Read more here

[rhmangmang]

Currently, we add the entry size each time we put it into cache map. However, if the key already exists in cache, we will add the size again which will cause the cache used size is higher than the actual size.

Also, in this PR, I improve the process of deserializing time series metadata cache from disk.

Hi, a PR should mainly contain one changing intention. It's better to open another PR to improve the process of deserializing time series metadata cache from disk.