chore: fix snowflake license

[simon824]

subtask of #2095

[codecov]

Codecov Report

Merging #2093 (85ca301) into master (eed6103) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2093   +/-   ##
=========================================
  Coverage     68.65%   68.65%           
+ Complexity      979      977    -2     
=========================================
  Files           479      479           
  Lines         39655    39655           
  Branches       5578     5578           
=========================================
  Hits          27226    27226           
  Misses         9783     9783           
  Partials       2646     2646           

Impacted Files	Coverage Δ
...che/hugegraph/backend/id/SnowflakeIdGenerator.java	69.49% <ø> (ø)
...a/org/apache/hugegraph/task/ServerInfoManager.java	73.25% <0.00%> (-1.75%)	⬇️
...n/java/org/apache/hugegraph/schema/IndexLabel.java	76.13% <0.00%> (-1.14%)	⬇️
...g/apache/hugegraph/backend/store/BackendTable.java	84.52% <0.00%> (-0.60%)	⬇️
...a/org/apache/hugegraph/backend/cache/RamCache.java	73.48% <0.00%> (+0.55%)	⬆️
...ache/hugegraph/backend/store/hbase/HbaseTable.java	76.96% <0.00%> (+0.60%)	⬆️
...a/org/apache/hugegraph/util/collection/IntSet.java	75.00% <0.00%> (+1.27%)	⬆️

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[imbajin]

Thanks, I'll check it with the official doc again

[imbajin]

@zyxxoo we should also check other license header problem in the repo

keep this PR open & update it until all header problems done

[zyxxoo]

remove "files"

[zyxxoo]

we need also add this license to release-docs/LICENSE and release-doc/NOTICES

[imbajin]

we need also add this license to release-docs/LICENSE and release-doc/NOTICES

no NOTICE in the original project, so only refer it in LICENSE

[javeme]

please check if we need address: #2093 (comment)