Issue fix 1773 and 1774

[KexinFeng]

1. Fix issue 1773 and issue 1774

In NDArray.set(NDArray index, Number value) add the feature of setting array values with integer indices, as shown in the use case #1773 as well as #1774.

This is similar to pr#1755 and is based on the advanced indexing pr#1719.

2. Fix an issue in the document of built-from-source

[frankfliu]

Can you provide a better commit message to describe this PR is for?

[codecov-commenter]

Codecov Report

Merging #1789 (7f3b6d3) into master (bb5073f) will decrease coverage by 2.51%.
The diff coverage is 65.10%.

❗ Current head 7f3b6d3 differs from pull request most recent head 2a51665. Consider uploading reports for the commit 2a51665 to get more accurate results

@@             Coverage Diff              @@
##             master    #1789      +/-   ##
============================================
- Coverage     72.08%   69.57%   -2.52%     
- Complexity     5126     5488     +362     
============================================
  Files           473      524      +51     
  Lines         21970    24316    +2346     
  Branches       2351     2644     +293     
============================================
+ Hits          15838    16918    +1080     
- Misses         4925     6086    +1161     
- Partials       1207     1312     +105     

Impacted Files	Coverage Δ
api/src/main/java/ai/djl/modality/cv/Image.java	69.23% <ø> (-4.11%)	⬇️
...rc/main/java/ai/djl/modality/cv/MultiBoxPrior.java	76.00% <ø> (ø)
...rc/main/java/ai/djl/modality/cv/output/Joints.java	71.42% <ø> (ø)
.../main/java/ai/djl/modality/cv/output/Landmark.java	100.00% <ø> (ø)
...main/java/ai/djl/modality/cv/output/Rectangle.java	72.41% <0.00%> (ø)
...i/djl/modality/cv/translator/BigGANTranslator.java	21.42% <ø> (-5.24%)	⬇️
...odality/cv/translator/BigGANTranslatorFactory.java	33.33% <0.00%> (+8.33%)	⬆️
...nslator/InstanceSegmentationTranslatorFactory.java	14.28% <0.00%> (-3.90%)	⬇️
.../cv/translator/SemanticSegmentationTranslator.java	0.00% <0.00%> (ø)
.../cv/translator/StyleTransferTranslatorFactory.java	40.00% <ø> (ø)
... and 414 more

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