Task: add more attribute requirements

[MVrachev]

What is the task about?

Attribute requirements implemented in pydantic with the Field class and coint, costr, etc. functions are a useful way to automatically verify that a payload provided by the user are exactly as we want.
Currently, for some attributes such as threshold, bit_length, version, etc. we don't provide such as there is a bug in our FastAPI version. See the discussion here: fastapi/fastapi#9140.
This bug is seen when a new documentation is generated.

As this bug is fixed in the latest FastAPI releases (at the time of writing this is 0.109.0) we can fix this bug and be free to add more requirements to our attributes.
To do this we need to close: #377 first.

For inspiration look at my commit before I realized there is an issue: MVrachev@8a00f5b

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