[fix] handle source types with additional parameters other than x,y,z; set default source_type = OpenStreetMap.Mapnik

[refactor] prepare openapi swagger: rename RawRequestInput type to ApiRequestBody, add ApiResponseBodyFailure and ApiResponseBodySuccess types

[fix] handle mapping source_type to url_tile on executing samexporter_predict()

[feat] add missing source_type argument on samexporter_predict use

[test] lambda_handler: add test rectangle and multi prompts cases

[fix] resolve wrong bbox order in case rectangle prompt

[refactor] set some methods as private

[refactor] reduce complexity of get_parsed_bbox_points method

[feat] add support for multi-prompt, both of type point and rectangle

[refactor] don't import complete modules, use only "from" syntax

[doc] update some docstrings

[refactor] apply suggestion from sonarlint

[docs] add more docs content

[refactor] migrate pydantic.parse to pydantic.model_validate

[feat] add input parsing and validation with pydantic, refactor code

[test] add get_parsed_bbox_points test case, refactor test structure