#425: Improve performance of INI/BC serialization

[priscavdsluis]

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[priscavdsluis]

With these changes the @veenstrajelmer tests will be about 33% faster (from ~30s to ~20s on 100000 rows)
There is still a problem with the AutoStart option (hence the failing tests), which may be solved in a different issue.

[priscavdsluis]

I think this PR could still be useful for the performance of writing BC/INI files.

At the moment, hydrolib-core creates all kinds of objects before writing/serializig them to a file. For example Property and Section objects for INI files.
But all of these objects are validated by Pydantic. This is desired and useful for reading files to validate user input, but not when writing them (we know the data that we write will be valid). So the validation during writing is not needed and reduces the performance.

According to Pydantic, creating objects can be up to 30x faster when object are created via the construct() function instead of the default initializer. So it might be worth looking into again.

https://docs.pydantic.dev/1.10/usage/models/#creating-models-without-validation