Add httpx.WriteError to client retryable exceptions

[zanieb]

I think this is similar to a retry on ReadError, but I'm not sure of the additional implications of retrying here.

Example

Crash reported:

Crash detected! Execution was interrupted by an unexpected exception: Traceback (most recent call last):
  File "/usr/local/lib/python3.10/asyncio/selector_events.py", line 924, in write
    n = self._sock.send(data)
BrokenPipeError: [Errno 32] Broken pipe

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/httpcore/_exceptions.py", line 10, in map_exceptions
    yield
  File "/usr/local/lib/python3.10/site-packages/httpcore/backends/asyncio.py", line 51, in write
    await self._stream.send(item=buffer)
  File "/usr/local/lib/python3.10/site-packages/anyio/streams/tls.py", line 202, in send
    await self._call_sslobject_method(self._ssl_object.write, item)
  File "/usr/local/lib/python3.10/site-packages/anyio/streams/tls.py", line 168, in _call_sslobject_method
    await self.transport_stream.send(self._write_bio.read())
  File "/usr/local/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 1297, in send
    raise self._protocol.exception
anyio.BrokenResourceError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/httpx/_transports/default.py", line 60, in map_httpcore_exceptions
    yield
  File "/usr/local/lib/python3.10/site-packages/httpx/_transports/default.py", line 353, in handle_async_request
    resp = await self._pool.handle_async_request(req)
  File "/usr/local/lib/python3.10/site-packages/httpcore/_async/connection_pool.py", line 253, in handle_async_request
    raise exc
  File "/usr/local/lib/python3.10/site-packages/httpcore/_async/connection_pool.py", line 237, in handle_async_request
    response = await connection.handle_async_request(request)
  File "/usr/local/lib/python3.10/site-packages/httpcore/_async/connection.py", line 90, in handle_async_request
    return await self._connection.handle_async_request(request)
  File "/usr/local/lib/python3.10/site-packages/httpcore/_async/http2.py", line 144, in handle_async_request
    raise exc
  File "/usr/local/lib/python3.10/site-packages/httpcore/_async/http2.py", line 106, in handle_async_request
    await self._send_request_headers(request=request, stream_id=stream_id)
  File "/usr/local/lib/python3.10/site-packages/httpcore/_async/http2.py", line 205, in _send_request_headers
    await self._write_outgoing_data(request)
  File "/usr/local/lib/python3.10/site-packages/httpcore/_async/http2.py", line 370, in _write_outgoing_data
    raise exc
  File "/usr/local/lib/python3.10/site-packages/httpcore/_async/http2.py", line 358, in _write_outgoing_data
    await self._network_stream.write(data_to_send, timeout)
  File "/usr/local/lib/python3.10/site-packages/httpcore/backends/asyncio.py", line 49, in write
    with map_exceptions(exc_map):
  File "/usr/local/lib/python3.10/contextlib.py", line 153, in __exit__
    self.gen.throw(typ, value, traceback)
  File "/usr/local/lib/python3.10/site-packages/httpcore/_exceptions.py", line 14, in map_exceptions
    raise to_exc(exc)
httpcore.WriteError

The above exception was the direct cause of the following exception:

httpx.WriteError

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