[FLINK-24397] Reduce legacy in Table API connectors - ASF JIRA

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Details

Type: Improvement
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: 1.15.0
Fix Version/s: 1.15.0
Component/s: Connectors / Common, Table SQL / API
Labels:
- pull-request-available

Release Note:
The old JDBC connector (indicated by `connector.type=jdbc` in DDL) has been removed. If not done already, users need to upgrade to the newer stack (indicated by `connector=jdbc` in DDL).

Description

The TableSchema class is now deprecated for a while but a lot of connectors still depend on it use (DynamicTableSources and DynamicTableSinks). We should reduce the usage of the TableSchema to provide a better example for external contributions and allow us eventually to drop the TableSchema.

It also drops the legacy JDBC connector.