Add serializer and validators

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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.16% (target: -5.00%)	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (244c7d757f98172ad228207510eba64c12c0cda2) | 2023 | 1961 | 96.94% | | | Head commit (cdbcd18367736e3fe893dfaddc9c942de55bd176) | 2065 (+42) | 2005 (+44) | 97.09% (**+0.16%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#128) | 86 | 86 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.89%. Comparing base (244c7d7) to head (cdbcd18).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #128 +/- ## ========================================== + Coverage 96.74% 96.89% +0.15% ========================================== Files 17 19 +2 Lines 2087 2129 +42 ========================================== + Hits 2019 2063 +44 + Misses 49 47 -2 Partials 19 19 ```

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