Generate missing metadata for Bitronix and Atomikos entries

We have a quite a few properties that are documented in the appendix without any metadata counter part. We should add them in preparation for #8237

The following prefixes are affected:

```
spring.jta.atomikos.connectionfactory
spring.jta.atomikos.datasource
spring.jta.bitronix.connectionfactory
spring.jta.bitronix.datasource
``` 