Feat(core): output filter

[diaohancai]

Purpose of the PR

• close #302

Main Changes

1. computation results output supports custom write.
2. SingleSourceShortestPathOutput implements org.apache.hugegraph.computer.core.output.ComputerOutput#filter

Verifying these changes

• [ ] Trivial rework / code cleanup without any test coverage. (No Need)
• [ ] Already covered by existing tests, such as (please modify tests here).
• [X] Need tests and can be verified as follows. org.apache.hugegraph.computer.algorithm.path.shortest.SingleSourceShortestPathTest

Does this PR potentially affect the following parts?

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

Documentation Status

• [ ] Doc - TODO
• [ ] Doc - Done
• [X] Doc - No Need