feat(server): support in-heap memory JVM monitor

[MingzhenHan]

Short Desc (Feature)

In order to avoid OOM errors caused by large queries, an jvm in heap memory monitoring mechanism was introduced in Hugegraph Server, which monitors the JVM's memory usage through scheduled tasks. If the threshold is exceeded, trigger GC or set interrupt flag to the corresponding thread to avoid OOM.

Related config PR: apache/incubator-hugegraph-doc#376

Details Docs

For more details, please visit the link:

• https://hugegraph.feishu.cn/wiki/MFUlwaMnwidj1Ukc53ycWzsSnkb (design doc)

• https://hugegraph.feishu.cn/wiki/YYVAwGOrCiiZC4k22R0cgOaFnYg (GC/OOM Mock/Test)

[codecov]

Codecov Report

Attention: Patch coverage is 38.46154% with 40 lines in your changes missing coverage. Please review.

Project coverage is 38.40%. Comparing base (355483f) to head (2fee36f).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
.../java/org/apache/hugegraph/dist/MemoryMonitor.java	30.90%	36 Missing and 2 partials ⚠️
.../hugegraph/backend/store/BackendEntryIterator.java	0.00%	1 Missing ⚠️
...ava/org/apache/hugegraph/dist/HugeGraphServer.java	66.66%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (355483f) and HEAD (2fee36f). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (355483f)	HEAD (2fee36f)
	7	2

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2650      +/-   ##
============================================
- Coverage     47.66%   38.40%   -9.26%     
+ Complexity      822      515     -307     
============================================
  Files           718      731      +13     
  Lines         58469    60132    +1663     
  Branches       7496     7802     +306     
============================================
- Hits          27868    23093    -4775     
- Misses        27814    34543    +6729     
+ Partials       2787     2496     -291     

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