create getPendingConfigurationChangeRequest for agents to poll

[swaroopar]

• [x] create new API getPendingConfigurationChangeRequest /xpanse/agent/poll/{serviceId}/{resourceName}
• [x] No authentication.
• [x] Mandatory query params – ServiceId and ResourceName
• [x] Return the oldest request with status PENDING and change the DB entry status to 'IN-PROGRESS'.
• [x] If any polling request is in IN-PROGRESS or COMPLETED for the specific serviceId and resourceName, then return 204 empty response.
• [x] Return – OrderId, config parameters as a map, ansibleScriptConfig (from OCL) and ansible inventory. - Define a data model for this.
• [x] Build ansible Inventory as JSON with only group name, host name and IP.
• [x] This API Controller must be activated only when a specific profile is provided. Profile name - 'agent-api'

Depends on https://github.com/eclipse-xpanse/xpanse/issues/1868

sample ansible inventory in JSON format

{
    "zookeeper": {
        "hosts": {
            "zookeeper-dfdfd": {
                "ansible_host": "192.168.11.2"
            },
        },
    },
    "kafka-broker": {
        "hosts": {
            "kafka-borker-dfdfdfd": {
                "ansible_host": "192.168.11.3"
            },
            "kafka-borker-absdf": {
                "ansible_host": "192.168.11.4"
            },
        },
    }
}

[WangLiNaruto]

let me do it