Capif aef security api (#5)

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  - AEF(API Exposing Function), is responsible for the exposure of the service APIs. Assuming that API Invokers are authorized by the CCF, AEF validates the authorization and subsequently provides the direct communication entry points to the service APIs. AEF may also authorize API invokers and record the invocations in log files.One provider can have multiple AEFs

OpenCAPIF SDK brings a set of functions to integrate with the 5G Core's function CAPIF, as defined in [3GPP Technical Specification (TS) 29.222 V18.5.0 Common API Framework for 3GPP Northbound APIs](https://www.etsi.org/deliver/etsi_ts/129200_129299/129222/18.05.00_60/ts_129222v180500p.pdf). This section shows the mapping between the Python functions available in this SDK and the CAPIF OpenAPI APIs defined the reference standard:

| **3GPP CAPIF API**                                    | **OpenCAPIF SDK function**                                  | **Description**                                             |

| /{apfId}/service-apis (GET)            | [get_all_services()](./doc/sdk_full_documentation.md#get-all-services)                                          | Retrieves a list of all available service APIs for a specific `apfId`            |

| /aef-security/v1/check-authentication (POST)            | [check_authentication()](./doc/sdk_full_documentation.md#check_authentication)                                          | This custom operation allows the API invoker to confirm the `supported_features` from the API exposing function(AEF)            |

NOTE: Above mentioned CAPIF APIs are defined in these 3GPP references:

- [CAPIF Invoker API specification](https://github.com/jdegre/5GC_APIs/blob/Rel-18/TS29222_CAPIF_API_Invoker_Management_API.yaml)

- [CAPIF Provider API specification](https://github.com/jdegre/5GC_APIs/blob/Rel-18/TS29222_CAPIF_API_Provider_Management_API.yaml)

  "invoker": {

    "invoker_folder": "",

    "capif_callback_url": "",

    "supported_features":"",

    "check_authorization":{

      "ip":"",

      "port":""

    "cert_generation": {

      "csr_common_name": "",

      "csr_organizational_unit": "",

      "csr_state_or_province_name": "",

      "csr_country_name": "",

      "csr_email_address": ""

    },

    "discover_filter": {

      "api-name": "",