refactor: extract document faker to crate

[shumkov]

Issue being fixed or feature implemented

DPP shouldn't have any external dependencies since this is a public library that is supposed to be cross-platform and cross-environment.

What was done?

• Extract document faker to a separate crate

How Has This Been Tested?

With existing tests. Added to CI

Breaking Changes

None

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone