add mongo distributed lock

[LXPWing]

What this PR does:
add mongo distributed lock

Which issue(s) this PR fixes:
#104

[seeflood]

demo/configuration/apollo/apolloClientDemo
There is no need to submit this binary file :)

[seeflood]

Thanks for your contribution!

[seeflood]

关于如何在ut中mock掉mongoDB:
我看mongo的sdk是返回一个叫 mongo.Client的struct对吧。struct不好mock，所以一般写ut的关键是：

• 先自己把struct封装成一个interface。具体来说，先定义一个interface，然后你的NewMongoClient(m MongoMetadata)这个函数应该返回这个interface，而不是mongo.Client这个struct
• 一但封装成interface了，在ut里就可以把他替换成自己的mock实现了

可以参考 @ZLBer 之前写的zookeeper lock

他当时也面临同样的问题（如何在ut里mock zk),解决方案是把zk 的connection封装成一个interface:

layotto/components/pkg/utils/zookeeper.go

Line 53 in e0e5eba

type ZKConnection interface {

[seeflood]

@ZLBer @whalesongAndLittleFish @stulzq Hi guys, could u help review this PR?

[codecov]

Codecov Report

Merging #348 (07a455c) into main (eb92185) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #348   +/-   ##
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  Coverage   57.62%   57.62%           
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  Files          48       48           
  Lines        2289     2289           
=======================================
  Hits         1319     1319           
  Misses        837      837           
  Partials      133      133           

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[ZLBer]

@LXPWing no big problem, next ,you need to add docs in docs/_sidebar.md docs/en/component_specs/lock/XX.md docs/zh/component_specs/lock/XX.md.by the way ,the mock can use gomock, it‘s quick.
thanks for your contribution.

[whalesongAndLittleFish]

nice~,LGTM

[seeflood]

Sorry for not replying !
I found that there are many ut failures in components package (including some compilation errors)
Our github workflow doesn't test the components package ,so we didn't know the issue until I recently read the code.....

I will submit a PR to fix the test cases and then go back to test and merge this PR.
Thanks!

solved

[seeflood]

Thanks again for your contribution!
This component will be included in layotto v0.4

[ZLBer]

@LXPWing Thanks for your contribution! Maybe you can try another community task~