Credentials for Plugins need to be handled separately

[sameersegal]

At the moment plugin credentials are passed as inputs. But we should segregate credentials from inputs in a plugin call.

Instead of this:

{
            "task_type": "plugin",
            "name": "submit_details_to_api_task",
            "read_variables": [
                "user_name",
                "user_email",
                "user_mobile_number",
                "user_address"
            ],
            "environment_variables": [
                "API_ENDPOINT",
                "CLIENT_ID",
                "CLIENT_SECRET"
            ],
            "write_variables": [
                "SUBMISSION_STATUS"
            ],
            "plugin": {
                "name": "data_submission",
                "inputs": {
                    "NAME": "user_name",
                    "EMAIL": "user_email",
                    "MOBILE_NUMBER": "user_mobile_number",
                    "ADDRESS": "user_address",
                    "API_ENDPOINT": "API_ENDPOINT",
                    "CLIENT_ID": "CLIENT_ID",
                    "CLIENT_SECRET": "CLIENT_SECRET"
                },
                "outputs": {
                    "SUBMISSION_STATUS": "SUBMISSION_STATUS"
                }
            },
            "description": "Submitting the collected user details to the API.",
            "transitions": [
                {
                    "code": "SUCCESS",
                    "goto": "submission_success_task",
                    "description": "Data was successfully submitted."
                },
                {
                    "code": "INVALID_DATA",
                    "goto": "submission_invalid_data_task",
                    "description": "The provided data is invalid. Please re-enter."
                },
            ]
        },

Do this:
Instead of this:

{
            "task_type": "plugin",
            "name": "submit_details_to_api_task",
            "read_variables": [
                "user_name",
                "user_email",
                "user_mobile_number",
                "user_address"
            ],
            "environment_variables": [
                "API_ENDPOINT",
                "CLIENT_ID",
                "CLIENT_SECRET"
            ],
            "write_variables": [
                "SUBMISSION_STATUS"
            ],
            "plugin": {
                "name": "data_submission",
                "environment_variables": {
                    "API_ENDPOINT": "API_ENDPOINT",
                    "CLIENT_ID": "CLIENT_ID",
                    "CLIENT_SECRET": "CLIENT_SECRET"
                }
                "inputs": {
                    "NAME": "user_name",
                    "EMAIL": "user_email",
                    "MOBILE_NUMBER": "user_mobile_number",
                    "ADDRESS": "user_address"
                },
                "outputs": {
                    "SUBMISSION_STATUS": "SUBMISSION_STATUS"
                }
            },
            "description": "Submitting the collected user details to the API.",
            "transitions": [
                {
                    "code": "SUCCESS",
                    "goto": "submission_success_task",
                    "description": "Data was successfully submitted."
                },
                {
                    "code": "INVALID_DATA",
                    "goto": "submission_invalid_data_task",
                    "description": "The provided data is invalid. Please re-enter."
                },
            ]
        },