feat: config api custom interception scripts

[pujavs]

Currently jans-config-api uses basic authentication, requirement is to use an interception scripts which can enable custom business logic for authentication.
For example, a customer may want to pass an access token with a custom claim, like {"role": "manager", "infrastructure": "prod"}
The script should read that information from the access token, and then write custom rules about whether to allow or deny the client authentication.
Note: Script already checked in branch 286 -> https://github.com/JanssenProject/jans/tree/jans-286/jans-linux-setup/static/extension/config_api

Details of jansCustomScr:

inum = preferable with 'A' example DN: inum=A110-88AB,ou=scripts,o=jans
description = Jans Config Api authorization script
displayName = config_api_authorization
jansConfProperty = {"value1":"testProp1","value2":"Test value 1","hide":false,"description":""}
jansConfProperty = {"value1":"testProp2","value2":"Test value 2","hide":false,"description":""}
jansEnabled = false
jansLevel = 100
jansModuleProperty= {"value1":"location_type","value2":"ldap","description":""}
jansProgLng = python
jansScrTyp = config_api_auth
jansScr = https://github.com/JanssenProject/jans/tree/jans-286/jans-linux-setup/static/extension/config_api
jansCustomScr-config-api.zip

Related config-api issue Issue-286 #286

[devrimyatar]

Implemeted in #882