Add `streamable_http_client` which accepts `httpx.AsyncClient` instea… #524

Job	Run time
checks / pre-commit	35s
checks / readme-snippets	12s
checks / test (3.10, highest, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.10, lowest-direct, windows-latest)	2m 17s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, lowest-direct, windows-latest)	2m 26s
checks / test (3.13, highest, ubuntu-latest)	45s
checks / test (3.12, lowest-direct, ubuntu-latest)	52s
checks / test (3.11, highest, windows-latest)	3m 3s
checks / test (3.12, lowest-direct, windows-latest)	3m 25s
checks / test (3.11, lowest-direct, windows-latest)	2m 25s
checks / test (3.10, highest, windows-latest)	3m 6s
checks / test (3.12, highest, ubuntu-latest)	52s
checks / test (3.11, highest, ubuntu-latest)	44s
checks / test (3.13, highest, windows-latest)	2m 32s
checks / test (3.13, lowest-direct, ubuntu-latest)	41s
checks / test (3.12, highest, windows-latest)	4m 27s
	30m 39s

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