Add deepObject support

[Yarn-e]

Problem statement

Currently deepObjects are not supported, this PR adds that support.

Description

Example spec

components:
    parameters:
      exampleParameter:
        name: paramObj
        in: query
        required: true
        explode: true
        style: deepObject
        schema:
          type: object
          properties: 
            count: 
              type: integer
            name:
              type: string

Sadly it doesn't really fit in the ParameterDeserializersFactory ideology as it would never reach that step as get_value() in parameters.py would always fail as it tries to find the name of the param_or_header in the specific location. This is because how a deepObjects query param looks like (e.g. someurl.com/?paramObj[count]=1&paramObj[name]=John), the function would try to find paramObj in the location, which it would not find as the QueryParams will be split into a dict like this: {'paramObj[count]': 1, 'paramObj[name]': John}.

In my proposed solution it would split the location dict key into 2 parts, the actual key we want to find paramObj and then create a dict of the 2nd part of the key (whats inside the brackets) with its actual value: {'count': 1, 'name': 'John'}.
Afterwards this dict is checked via the schema of the object.

I highly doubt this solution will get accepted, so if you know a way to make this cleaner/better please lmk 🙏

Todos

• Tests

Related issue

• Is there support for deep Object in query params #250

[codecov]

Codecov Report

Merging #379 (cc42e15) into master (868c081) will decrease coverage by 0.08%.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
- Coverage   93.16%   93.08%   -0.09%     
==========================================
  Files          94       94              
  Lines        2311     2327      +16     
  Branches      286      291       +5     
==========================================
+ Hits         2153     2166      +13     
- Misses        123      124       +1     
- Partials       35       37       +2     

Impacted Files	Coverage Δ
openapi_core/schema/parameters.py	92.45% <81.25%> (-4.92%)	⬇️
openapi_core/deserializing/parameters/factories.py	100.00% <100.00%> (ø)

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[p1c2u]

We can add this as experimental support.