feat(algorithm): support random walk in computer

[diaohancai]

Purpose of the PR

• close #273

Main Changes

Add an algorithm: random walk.

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. Please run unit test: org.apache.hugegraph.computer.algorithm.sampling.RandomWalkTest#testRunAlgorithm

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

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

[javeme]

note ci error:

computer-algorithm/src/main/java/org/apache/hugegraph/computer/algorithm/sampling/RandomWalk.java:111:
Line is longer than 100 characters (found 106). [LineLength]

[codecov[bot]]

Codecov Report

Merging #274 (565d6e7) into master (a21a191) will decrease coverage by 0.66%. Report is 2 commits behind head on master. The diff coverage is 94.28%.

@@             Coverage Diff              @@
##             master     #274      +/-   ##
============================================
- Coverage     85.82%   85.17%   -0.66%     
- Complexity     3233     3277      +44     
============================================
  Files           344      349       +5     
  Lines         12124    12388     +264     
  Branches       1092     1112      +20     
============================================
+ Hits          10406    10552     +146     
- Misses         1193     1305     +112     
- Partials        525      531       +6     

Files	Coverage Δ
.../computer/algorithm/sampling/RandomWalkOutput.java	100.00% <100.00%> (ø)
.../computer/algorithm/sampling/RandomWalkParams.java	100.00% <100.00%> (ø)
...computer/algorithm/sampling/RandomWalkMessage.java	94.11% <94.11%> (ø)
...egraph/computer/algorithm/sampling/RandomWalk.java	92.06% <92.06%> (ø)

... and 13 files with indirect coverage changes

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