Bump version to 4.1.4-SNAPSHOT; allow table configs prefixed with 'metadata.*'

[jeffxiang]

Currently, PscDynamicTableFactory and UpserPscDynamicTableFactory will reject DDL's which contain configs other than the ones defined to be relevant to the connector. This does not allow users to supply additional metadata into the DDL's for various purposes, such as cataloging.

This PR allows for table metadata configs which are irrelevant to the connector to be passed into the FlinkSQL PSC connector DDL's. For example, if users want to supply table metadata for cataloging purposes, they can do so by prefixing those fields with metadata..

Example:

CREATE TABLE psc_test_source (
   ...
) WITH (
  'connector' = 'psc',
  'scan.startup.mode' = 'group-offsets',
  ...
  'metadata.table-description' = 'foo',
  'metadata.table-tiering' = '2'
)

Also bumping version to 4.1.4-SNAPSHOT