oradb-manage-pdb: More options to create PDBs

[Rendanic]

Add more options to create a PDB.
Ideas:

• clone from external pdb
  create pluggable database ORDERFUL as clone using '/u02/charset_pdbs/filename.pdb';
• clone from Database-Link

[github-actions]

This issue is stale because it has been open for 30 days with no activity. Auto close in 30 days.