feat: Port `load_parameters` to the Python SDK #214

Job	Run time
adk-py / test	20s
langchain-py (3.10, ubuntu-latest) / test	22s
langchain-py (3.10, windows-latest) / test	56s
langchain-py (3.13, ubuntu-latest) / test	21s
langchain-py (3.11, windows-latest) / test	1m 24s
langchain-py (3.12, windows-latest) / test	1m 5s
build (3.10, windows-latest, 0)	10m 18s
build (3.10, ubuntu-latest, 0)	5m 25s
build (3.11, windows-latest, 1)	12m 7s
build (3.11, ubuntu-latest, 1)	6m 45s
build (3.10, ubuntu-latest, 1)	6m 24s
build (3.11, ubuntu-latest, 0)	5m 23s
build (3.11, windows-latest, 0)	9m 10s
build (3.12, windows-latest, 0)	9m 21s
build (3.12, ubuntu-latest, 0)	5m 54s
build (3.12, windows-latest, 1)	14m 27s
build (3.13, ubuntu-latest, 1)	6m 27s
build (3.14, ubuntu-latest, 1)	6m 40s
build (3.13, ubuntu-latest, 0)	5m 9s
langchain-py (3.12, ubuntu-latest) / test	21s
build (3.14, windows-latest, 1)	11m 59s
build (3.14, ubuntu-latest, 0)	5m 35s
build (3.14, windows-latest, 0)	10m 6s
langchain-py (3.11, ubuntu-latest) / test	24s
build (3.12, ubuntu-latest, 1)	6m 28s
build (3.10, windows-latest, 1)	12m 4s
build (3.13, windows-latest, 0)	9m 4s
langchain-py (3.13, windows-latest) / test	1m 22s
build (3.13, windows-latest, 1)	12m 17s
upload-wheel	23s
	2h 58m 1s

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