JIRA: https://jira.spring.io/browse/INT-2625,
https://jira.spring.io/browse/INT-4050,
https://jira.spring.io/browse/INT-4052
Make some refactoring for consistency:
- Move `JdbcMessageStore` to the `store` package
- Make `JdbcMessageStore` only ctor-based configuration for the `JdbcOperations`
- Remove `/channel/` SQL scripts in favor of combined in the `/jdbc/` directory
- Make scripts for the `INT_CHANNEL_MESSAGE` table and indexes generated via VPP
Fix drop script generation
Fix `schema-derby.sql` for suspicious `[]`
Looks like `foundrylogic.vpp` tool generates somehow wrong SQL
Further fix for the `drop` scripts generation
Address PR comments:
* Remove deprecated code in the `JdbcMessageStore`
* Remove separate MySQL script in favor of only one for latest version
* Remove the note in the `jdbc.adoc` about recommendation to use new MySQL version
5224779a04