feat: added the Azure Document Intelligence (#395)

* added the Azure Document Intelligence

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* fixed the formatting and MyPy, working on the tests now

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* fixed the tests

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* added test document

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* replace all  with pydantic dataclasses

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* minor azure serializer refactoring

Signed-off-by: Panos Vagenas <pva@zurich.ibm.com>

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Signed-off-by: Peter Staar <taa@zurich.ibm.com>
Signed-off-by: Panos Vagenas <pva@zurich.ibm.com>
Co-authored-by: Panos Vagenas <pva@zurich.ibm.com>

Author: PeterStaar-IBM