support config client name

[marlondu]

#361
you can config your client name in jdbc url or datasource properties with client_name.
for example
Properties props = new Properties();
props.put("client_name", "ck-client");
DataSource singleDataSource = new BalancedClickhouseDataSource("jdbc:clickhouse://127.0.0.1:9000", props);

[codecov]

Codecov Report

Merging #362 (a8e3388) into master (2b8d60f) will increase coverage by 0.05%.
The diff coverage is 85.00%.

@@             Coverage Diff              @@
##             master     #362      +/-   ##
============================================
+ Coverage     61.84%   61.90%   +0.05%     
- Complexity     1191     1192       +1     
============================================
  Files           131      131              
  Lines          6401     6418      +17     
  Branches        475      475              
============================================
+ Hits           3959     3973      +14     
- Misses         2175     2178       +3     
  Partials        267      267              

Impacted Files	Coverage Δ
...m/github/housepower/settings/ClickHouseConfig.java	77.12% <78.57%> (-0.19%)	⬇️
...m/github/housepower/jdbc/ClickHouseConnection.java	53.27% <100.00%> (ø)
...ava/com/github/housepower/settings/SettingKey.java	99.29% <100.00%> (+<0.01%)	⬆️

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[sundy-li]

LGTM, thanks for your contribution @marlondu