enhance the jdbc datasource to support multiple table query

[Nicole00]

Enhance the data reading capabilities of relational databases：

1. support single-table scanning, and also support multi-table queries.
2. For nebula-exchange_spark_2.2, since the jdbc datasource only allows reading of a single table, and does not allow querying from the database, we support to query the single table in SparkSQL and still does not support multiple tables query.

for nebula-exchange_spark_2.2, the jdbc config should be:

      url:"jdbc:mysql://127.0.0.1:3306/test"
      driver: "com.mysql.cj.jdbc.Driver"
      user: "nebula"
      password: "Nebula@123"
      table: "test.people"
      sentence: "select * from  people" #sentence config is optional. the table name in sentence must just be table, not db.name

the mysql/oracle/postgresql config shoud just config table, do not support sentence.

for nebula-exchange_spark_2.4 or 3.0, the jdbc config should be:

      url:"jdbc:mysql://127.0.0.1:3306/test"
      driver: "com.mysql.cj.jdbc.Driver"
      user: "nebula"
      password: "Nebula@123"
      table: "test.people"
      # sentence and table cannot config together.
      # sentence: "select * from  people, player, team"

the same for mysql/oracle/postgresql as jdbc.

[codecov-commenter]

Codecov Report

Patch coverage: 15.78% and project coverage change: -0.23% ⚠️

Comparison is base (1f40692) 56.01% compared to head (4eaca63) 55.78%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #153      +/-   ##
============================================
- Coverage     56.01%   55.78%   -0.23%     
  Complexity       83       83              
============================================
  Files            18       18              
  Lines          1655     1667      +12     
  Branches        315      326      +11     
============================================
+ Hits            927      930       +3     
- Misses          556      559       +3     
- Partials        172      178       +6     

Files Changed	Coverage Δ
.../vesoft/exchange/common/config/SourceConfigs.scala	49.71% <12.00%> (-4.19%)	⬇️
...la/com/vesoft/exchange/common/config/Configs.scala	63.78% <23.07%> (+0.66%)	⬆️

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