Password are saved in the connection configuration files

[gvlx]

Describe the bug
Passwords should be stored on a secure vault

To Reproduce
Check the files in ..\repository\jmxapplications

Expected behavior
Only a password handle should exist on the file.

Desktop (please complete the following information):

• OS: Windows 10 (10.0) , amd64 64bit
• JDK: version 11.0.10; OpenJDK 64-Bit Server VM (11.0.10+8-jvmci-21.0-b06, mixed mode, sharing)
• Version: 2.0.6 (Build 201219); platform 20201027-unknown-revn

Additional context
Consider using the same approach as in "Java Mission Control".

[thurka]

Done in master for newly created JMX connections.