fix: support new HugeGraph edge id format

[hutiefang76]

Purpose of the PR

• close [Bug] The edge id is formatted by 5 instead of 4 parts #324

HugeGraph server now formats edge ids with 5 or 6 parts after the parent/child edge label change. The computer loader still called Edge.name() from the older client, which expects exactly 4 parts and can fail while loading edges for algorithms such as LPA.

Main Changes

• Add HugeConverter.convertEdgeName() to read sort values from 4-part, 5-part, and 6-part edge ids.
• Use the converter in LoadService instead of calling edge.name() directly.
• Add regression coverage for both 5-part and 6-part edge id formats.

Verifying these changes

• Trivial rework / code cleanup without any test coverage. (No Need)
• Already covered by existing tests, such as (please modify tests here).
• Need tests and can be verified as follows.

mvn -pl computer-test -am -Djacoco.skip=true \
  -Dtest=HugeConverterTest#testConvertEdgeNameWithFivePartEdgeId+testConvertEdgeNameWithSixPartEdgeId \
  -Dsurefire.failIfNoSpecifiedTests=false test

mvn -pl computer-test -am -Djacoco.skip=true \
  -Dtest=HugeConverterTest \
  -Dsurefire.failIfNoSpecifiedTests=false test

Does this PR potentially affect the following parts?

• Nope
• Dependencies (add/update license info)
• Modify configurations
• The public API
• Other affects (typed here)

Documentation Status

• Doc - TODO
• Doc - Done
• Doc - No Need