fix(loader): loader options

[liuxiaocs7]

Purpose of the PR

• close [Enhancement] Improve user experience for loader #442

Main Changes

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:
  • xxx

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

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (b066b80) 62.49% compared to head (792f8be) 62.47%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
...egraph/loader/direct/loader/HBaseDirectLoader.java	0.00%	2 Missing ⚠️
.../apache/hugegraph/loader/executor/LoadOptions.java	33.33%	2 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## master #548 +/- ## ============================================ - Coverage 62.49% 62.47% -0.03%  + Complexity 1903 930 -973  ============================================ Files 262 93 -169 Lines 9541 4509 -5032 Branches 886 529 -357 ============================================ - Hits 5963 2817 -3146  + Misses 3190 1483 -1707  + Partials 388 209 -179 

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[javeme]

LGTM