Support scan Nebula subgraph results (vertex and edge)

[haoxins]

What type of PR is this?

• [ ] bug
• [x] feature
• [x] enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

[haoxins]

need to add some tests

[haoxins]

ok, at least I didn't break anything :joy:

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 63.10680% with 38 lines in your changes missing coverage. Please review.

Project coverage is 64.41%. Comparing base (4e4de32) to head (b6d665c).

Files with missing lines	Patch %	Lines
result_set.go	63.10%	30 Missing and 8 partials :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #346 +/- ## ========================================== + Coverage 64.36% 64.41% +0.05% ========================================== Files 11 11 Lines 2963 3041 +78 ========================================== + Hits 1907 1959 +52 - Misses 897 915 +18 - Partials 159 167 +8 ```

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[wey-gu]

@haoxins is this still in draft state or?

[haoxins]

@haoxins is this still in draft state or?

draft, I need to add some basic tests later

[haoxins]

ready to go~

[wey-gu]

@Nicole00 kindly take a review on this work, please? 😊

[haoxins]

hello, any advice?