[#389] Improvement: Make codec to be a singleton.

[tobehardest]

What changes were proposed in this pull request?

Codec will be created for many times. We should make codec to be a singleton. I make codec to be a singleton.

Why are the changes needed?

Fix: #389

Does this PR introduce any user-facing change?

No.

How was this patch tested?

UT

[smallzhongfeng]

PTAL @zuston

[codecov-commenter]

Codecov Report

Merging #840 (41b00a4) into master (4a17a58) will increase coverage by 2.32%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #840      +/-   ##
============================================
+ Coverage     57.09%   59.42%   +2.32%     
- Complexity     2144     2147       +3     
============================================
  Files           321      301      -20     
  Lines         15648    13295    -2353     
  Branches       1243     1243              
============================================
- Hits           8934     7900    -1034     
+ Misses         6206     4960    -1246     
+ Partials        508      435      -73     

Impacted Files	Coverage Δ
...a/org/apache/uniffle/common/compression/Codec.java	100.00% <100.00%> (ø)
...rg/apache/uniffle/common/compression/Lz4Codec.java	85.71% <100.00%> (+2.38%)	⬆️
...g/apache/uniffle/common/compression/NoOpCodec.java	100.00% <100.00%> (ø)
...apache/uniffle/common/compression/SnappyCodec.java	57.89% <100.00%> (+2.33%)	⬆️
...g/apache/uniffle/common/compression/ZstdCodec.java	75.86% <100.00%> (+0.86%)	⬆️

... and 25 files with indirect coverage changes

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[jerqi]

LGTM, thanks all

[jerqi]

Merged to master.

[jerqi]

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[tobehardest]

done.