### Expose `dbCreateRecord` in IOC shell

Add a new IOC shell command `dbCreateRecord` allowing for records to be created
from the shell.

Only works when called before `iocInit` and will fail if called afterwards.

The pdbbase variable, a record type, and the new record's name should be passed
as arguments.

Example usage:

```sh
dbCreateRecord(pdbbase, "ai", "example:ai")
iocInit()
```