add serial id to XxException class

[javeme]

Change-Id: I00bb4a738333b95312403c5bd5cde954487c0d5b

[codecov]

Codecov Report

Merging #54 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master     #54   +/-   ##
========================================
  Coverage      63.5%   63.5%           
  Complexity      300     300           
========================================
  Files            48      48           
  Lines          1518    1518           
  Branches        178     178           
========================================
  Hits            964     964           
  Misses          454     454           
  Partials        100     100

Impacted Files	Coverage Δ	Complexity Δ
...aidu/hugegraph/loader/exception/LoadException.java	50% <ø> (ø)	2 <0> (ø)	⬇️
...du/hugegraph/loader/exception/InsertException.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...idu/hugegraph/loader/exception/ParseException.java	46.15% <ø> (ø)	2 <0> (ø)	⬇️
...n/java/com/baidu/hugegraph/loader/reader/Line.java	63.15% <0%> (ø)	8% <0%> (ø)	⬇️

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