New enhancement for registry.

[tristaZero]

Fixes #1150 #1151 #1153 .

Changes proposed in this pull request:

• Close old dataSources for registry when refresh.
• Modify the usage for CircuitBreakerDataSource in registry.
• Decouple Sharding-Orchestration from Sharding-JDBC.
• Modify some unit tests.
• Significantly alter ShardingDataSource and ShardingContext.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (dev@b4735e1). Click here to learn what that means.
The diff coverage is 26.69%.

@@          Coverage Diff           @@
##             dev    #1167   +/-   ##
======================================
  Coverage       ?   57.42%           
======================================
  Files          ?      664           
  Lines          ?    12830           
  Branches       ?     2046           
======================================
  Hits           ?     7368           
  Misses         ?     4998           
  Partials       ?      464

Impacted Files	Coverage Δ
.../core/jdbc/core/connection/ShardingConnection.java	52.17% <ø> (ø)
.../core/orche/resultset/CircuitBreakerResultSet.java	0% <ø> (ø)
.../core/orche/statement/CircuitBreakerStatement.java	0% <ø> (ø)
...orche/metadata/CircuitBreakerDatabaseMetaData.java	96.69% <ø> (ø)
...ore/orche/datasource/CircuitBreakerDataSource.java	100% <ø> (ø)
...ore/orche/connection/CircuitBreakerConnection.java	100% <ø> (ø)
...che/resultset/CircuitBreakerResultSetMetaData.java	0% <ø> (ø)
...tion/internal/config/ConfigMapListenerManager.java	61.9% <ø> (ø)
...us/state/circuit/CircuitStateEventBusInstance.java	0% <ø> (ø)
...che/statement/CircuitBreakerPreparedStatement.java	0% <ø> (ø)
... and 22 more

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