feat(python): add --pydantic-base-model option #910

Job	Run time
build	45s
typescript,typescript-zod,typescript-effect-schema	3m 14s
javascript,schema-javascript	1m 23s
golang,schema-golang	1m 25s
cjson,schema-cjson	1m 57s
cplusplus,schema-cplusplus	2m 54s
flow,schema-flow	2m 0s
java,schema-java	5m 52s
python,schema-python	2m 12s
haskell,schema-haskell	8m 25s
csharp,schema-csharp,schema-json-csharp,graphql-csharp,csharp-SystemTextJson	6m 8s
json-ts-csharp	2m 4s
dart,schema-dart	1m 25s
swift,schema-swift	2m 40s
javascript-prop-types	1m 30s
ruby	1m 14s
php	1m 4s
scala3,schema-scala3	2m 37s
elixir,schema-elixir,graphql-elixir	6m 56s
rust,schema-rust	4m 8s
kotlin,schema-kotlin,kotlin-jackson,schema-kotlin-jackson	6m 49s
objective-c	3m 56s
test-complete	0s
	1h 10m 38s

Provide feedback