add spark job name and description

[ggzone]

当存在大量tag和edge任务时，SparkUI默认展示信息不太友好，添加Job名称和描述

[CLAassistant]

All committers have signed the CLA.

[Nicole00]

Thanks for your great improve for experience~ just one issue, could you please format your code?

[codecov-commenter]

Codecov Report

Merging #33 (15fc91a) into master (cd851ea) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master      #33      +/-   ##
============================================
- Coverage     28.07%   28.03%   -0.04%     
  Complexity        6        6              
============================================
  Files            24       24              
  Lines          2112     2115       +3     
  Branches        396      396              
============================================
  Hits            593      593              
- Misses         1412     1415       +3     
  Partials        107      107              

Impacted Files	Coverage Δ
...in/scala/com/vesoft/nebula/exchange/Exchange.scala	2.04% <0.00%> (-0.04%)	⬇️

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[ggzone]

@Nicole00 Please check whether the code should be formated again? If it is possible, please give me a specification.Thanks.

[Nicole00]

LGTM, thanks~