support to config the encrypted password

[Nicole00]

close #190

1. support to config the encrypted password
2. support to encrypt the password and provide the RSA private key
   spark-submit --master local --class com.vesoft.exchange.common.PasswordEncryption nebula-exchange_spark_2.4-3.0-SNAPSHOT.jar -p {password}

[Nicole00]

how to generate the encrypted password and private key:
https://github.com/vesoft-inc/nebula-exchange/pull/192/files#diff-3b6459f9330e366b00c2c21b99b2b154ed014c619559a4ed6d3328585d5995db

how to config the encrypted passwd:
https://github.com/vesoft-inc/nebula-exchange/pull/192/files#diff-b945be44a8d9feef0dbfed67bad582986e270977275e61fc26730e989847433f

[codecov-commenter]

Codecov Report

Attention: 47 lines in your changes are missing coverage. Please review.

Comparison is base (ffae04c) 51.85% compared to head (8020171) 50.66%.

Files	Patch %	Lines
...om/vesoft/exchange/common/PasswordEncryption.scala	0.00%	44 Missing ⚠️
...la/com/vesoft/exchange/common/config/Configs.scala	50.00%	1 Missing and 2 partials ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #192      +/-   ##
============================================
- Coverage     51.85%   50.66%   -1.20%     
  Complexity       89       89              
============================================
  Files            21       22       +1     
  Lines          1913     1962      +49     
  Branches        378      383       +5     
============================================
+ Hits            992      994       +2     
- Misses          733      778      +45     
- Partials        188      190       +2     

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