refact: clean extra store file in all modules

[imbajin]

TODO:

• we need use a better way to download it when building binary package
• ensure the deleted file keystore or license.json is no longer needed @javeme

@simon824 download the file in building or let user download it manually when they need https? (and we add a doc/link for it)

[codecov]

Codecov Report

Merging #434 (87c95a2) into master (6ac5a87) will increase coverage by 0.01%.
The diff coverage is 62.50%.

@@             Coverage Diff              @@
##             master     #434      +/-   ##
============================================
+ Coverage     62.55%   62.57%   +0.01%     
- Complexity     1866     1867       +1     
============================================
  Files           260      260              
  Lines          9412     9418       +6     
  Branches        872      872              
============================================
+ Hits           5888     5893       +5     
- Misses         3142     3143       +1     
  Partials        382      382              

Impacted Files	Coverage Δ
...rg/apache/hugegraph/loader/constant/Constants.java	75.00% <ø> (ø)
...apache/hugegraph/loader/util/HugeClientHolder.java	28.84% <0.00%> (+0.54%)	⬆️
...ain/java/org/apache/hugegraph/util/CommonUtil.java	86.95% <71.42%> (-6.80%)	⬇️

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[imbajin]

Download one file failed, need check it

Update: fixed it