BP-1179: Add support for creating Pydantic records

[andreparames]

Adapts the DB endpoints to create documents (that is, Annotation, Nodes, etc) using Pydantic if they've already been migrated.

Also improves typing hints.

Needed to fix https://movai.atlassian.net/browse/BP-1179

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[sonarcloud[bot]]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud