Change the method definition of UndoLogParser for better extensibility.

[ujjboy]

Ⅰ. Describe what this PR did

• change the method definition of UndoLogParser.
  • String encode(BranchUndoLog branchUndoLog) -> byte[] encode(BranchUndoLog branchUndoLog)
  • BranchUndoLog decode(String data) -> BranchUndoLog decode(byte[] bytes)
• Use transient instead of @JSONField(serialize = false) for ignore serialization of field tableMeta
• Refactor test case for more abstract.

Ⅱ. Does this pull request fix one issue?

Fix #1088

[codecov-io]

Codecov Report

Merging #1090 into develop will decrease coverage by 0.13%.
The diff coverage is 24%.

@@              Coverage Diff              @@
##             develop    #1090      +/-   ##
=============================================
- Coverage      41.87%   41.73%   -0.14%     
  Complexity      1361     1361              
=============================================
  Files            243      243              
  Lines          10112    10118       +6     
  Branches        1321     1325       +4     
=============================================
- Hits            4234     4223      -11     
- Misses          5329     5347      +18     
+ Partials         549      548       -1

Impacted Files	Coverage Δ	Complexity Δ
...o/seata/rm/datasource/sql/struct/TableRecords.java	73.68% <ø> (ø)	13 <0> (ø)	⬇️
...ata/rm/datasource/undo/JSONBasedUndoLogParser.java	100% <100%> (ø)	3 <2> (ø)	⬇️
...va/io/seata/rm/datasource/undo/UndoLogManager.java	22.64% <13.63%> (-0.59%)	8 <1> (ø)
...server/store/file/FileTransactionStoreManager.java	41.46% <0%> (-4.53%)	19% <0%> (ø)

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[zhangthen]

LGTM

[zhangthen]

Just modify the return type of "UndoLogParser", LGTM.

[leizhiyuan]

Please change the title ，It fixes a bug of JSON encode

[leizhiyuan]

@github-ygy need your review.

[xingfudeshi]

LGTM.