feat(r3-corda-ent): option to use other supported dbs in place of h2 dbs

[suvajit-sarkar]

Description

As a developer I want to enable the feature to choose external dbs for cenm and corda-ent nodes in place of existing filesystem based h2 db.

Acceptance Criteria

1. Add helm chart for the supported external db
2. Modify node/cenm configurations to switch to external db when specified
3. Network deployed successfully

[davodkazmkhany]

arttin