fix id compare between id types

[javeme]

error like: NumberFormatException for input string "xx" when
call LongId.compareTo(StringId)

Change-Id: Ie4683406313ea42d4e38ce3f84bd70c61f4d2a5b

[codecov]

Codecov Report

Merging #1147 into master will decrease coverage by 0.05%.
The diff coverage is 15.00%.

@@             Coverage Diff              @@
##             master    #1147      +/-   ##
============================================
- Coverage     65.85%   65.80%   -0.06%     
- Complexity     5654     5655       +1     
============================================
  Files           355      355              
  Lines         28848    28865      +17     
  Branches       4053     4058       +5     
============================================
- Hits          18998    18994       -4     
- Misses         7965     7981      +16     
- Partials       1885     1890       +5     

Impacted Files	Coverage Δ	Complexity Δ
...va/com/baidu/hugegraph/backend/id/IdGenerator.java	73.52% <15.00%> (-7.99%)	22.00 <2.00> (+2.00)	⬇️
...va/com/baidu/hugegraph/task/ServerInfoManager.java	71.59% <0.00%> (-2.85%)	51.00% <0.00%> (-1.00%)
...ain/java/com/baidu/hugegraph/task/TaskManager.java	72.54% <0.00%> (-1.31%)	28.00% <0.00%> (ø%)

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