optimize: optimize the memory footprint of redis mode

[funky-eyes]

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

fixes #3526

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #3528 (43f4406) into develop (6400385) will decrease coverage by 0.01%.
The diff coverage is 75.00%.

@@              Coverage Diff              @@
##             develop    #3528      +/-   ##
=============================================
- Coverage      52.09%   52.07%   -0.02%     
- Complexity      3498     3500       +2     
=============================================
  Files            637      637              
  Lines          21105    21113       +8     
  Branches        2618     2618              
=============================================
+ Hits           10994    10995       +1     
- Misses          9025     9030       +5     
- Partials        1086     1088       +2     

Impacted Files	Coverage Δ	Complexity Δ
.../java/io/seata/core/store/BranchTransactionDO.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...rage/redis/store/RedisTransactionStoreManager.java	64.15% <80.76%> (-0.23%)	39.00 <5.00> (+1.00)	⬇️
...n/src/main/java/io/seata/common/util/IdWorker.java	77.08% <0.00%> (-6.25%)	11.00% <0.00%> (-1.00%)

[xingfudeshi]

LGTM.

[funky-eyes]

@ph3636 @lightClouds917 PTAL

[codecov-commenter]

Codecov Report

Merging #3528 (8fe8665) into develop (1ab63ea) will decrease coverage by 0.00%.
The diff coverage is 75.00%.

@@              Coverage Diff              @@
##             develop    #3528      +/-   ##
=============================================
- Coverage      51.89%   51.88%   -0.01%     
- Complexity      3533     3534       +1     
=============================================
  Files            639      639              
  Lines          21408    21414       +6     
  Branches        2665     2665              
=============================================
+ Hits           11109    11110       +1     
- Misses          9190     9195       +5     
  Partials        1109     1109              

Impacted Files	Coverage Δ	Complexity Δ
.../java/io/seata/core/store/BranchTransactionDO.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ata/rm/datasource/undo/AbstractUndoLogManager.java	51.42% <0.00%> (ø)	19.00 <0.00> (ø)
...in/java/io/seata/server/session/GlobalSession.java	83.47% <80.00%> (+0.43%)	76.00 <0.00> (+1.00)
...rage/redis/store/RedisTransactionStoreManager.java	64.15% <80.76%> (-0.23%)	39.00 <5.00> (+1.00)	⬇️
...o/seata/server/coordinator/DefaultCoordinator.java	52.58% <100.00%> (+0.02%)	28.00 <0.00> (ø)
...n/src/main/java/io/seata/common/util/IdWorker.java	77.08% <0.00%> (-6.25%)	11.00% <0.00%> (-1.00%)

[ph3636]

LGTM

[slievrly]

LGTM, vote for @ph3636