Feature/239 add partij identificatoren on partij creation

[danielmursa-dev]

Fixes #239

// POST /partijen allow to pass a list of partijIdentificatoren:

• partij_identificator or UUID

// POST /partijen
{
    ...
    ...
    # list of partij identificatoren
    "partijIdentificatoren": [
        # create new partij_identificator and attach to partij
        {
            "anderePartijIdentificator": "string",
            "partijIdentificator": {
                "codeObjecttype": "niet_natuurlijk_persoon",
                "codeSoortObjectId": "rsin",
                "objectId": "296648875",
                "codeRegister": "hr",
            },
        },
        # attach existing partij_identificator with UUID to partij
        {
            "uuid": str(partij_identificator.uuid),
        },
    ],
    ...
    ...
}

// PUT /partijen allow to pass a list of partijIdentificatoren:

• partij_identificator obj or UUID

// PUT /partijen
3 cases:

# 1 no action is performed
{
    ...
    ...
    # None or not specified key in PUT /partijen
    "partijIdentificatoren": None
    ...
    ...
}

# 2 delete all partijIdentificatoren, because specified a empty list
{
    ...
    ...
    # empty list in PUT /partijen
    "partijIdentificatoren": []
    ...
    ...
}

# 3 delete all partijIdentificatoren and attach new partij_identificator as in POST
{
    ...
    ...
    # list of partij identificatoren
    "partijIdentificatoren": [
        # create new partij_identificator and attach to partij
        {
            "anderePartijIdentificator": "string",
            "partijIdentificator": {
                "codeObjecttype": "niet_natuurlijk_persoon",
                "codeSoortObjectId": "rsin",
                "objectId": "296648875",
                "codeRegister": "hr",
            },
        },
        # attach existing partij_identificator with UUID to partij
        {
            "uuid": str(partij_identificator.uuid),
        },
    ],
    ...
    ...
}

**
For updating partij-identificatoren, this is not the right endpoint, because the edpoint /partij-identificatoren/ remains accessible for their operation.
**

[swrichards]

One or two conceptual points to consider, see the comments.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 99.22481% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.21%. Comparing base (e6a3ea4) to head (8d4b20f).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
...nents/klantinteracties/api/serializers/partijen.py	97.14%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
+ Coverage   97.10%   97.21%   +0.11%     
==========================================
  Files         179      182       +3     
  Lines        8671     9061     +390     
==========================================
+ Hits         8420     8809     +389     
- Misses        251      252       +1     

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