feat(bindings/python): Enable BlockingLayer for non-blocking services that don't support blocking

[messense]

Not sure why but it doesn't really work currently.

Python 3.11.0 (main, Oct 25 2022, 16:25:24) [Clang 14.0.0 (clang-1400.0.29.102)]
Type 'copyright', 'credits' or 'license' for more information
IPython 8.9.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import opendal

In [2]: op = opendal.Operator("s3", bucket="test", region="us-east-1")

In [3]: op.list("/")
---------------------------------------------------------------------------
Error                                     Traceback (most recent call last)
Cell In[3], line 1
----> 1 op.list("/")

Error: Unsupported (permanent) at blocking_list, context: { service: s3, path: / } => operation is not supported

[Xuanwo]

Not sure why but it doesn't really work currently.

Seems it's not the latest code. I tested this PR locally with pyo3_runtime.PanicException error:

:) python
>>> import opendal
>>> op = opendal.Operator("s3", bucket="test", region="us-east-1")
thread '<unnamed>' panicked at 'blocking layer must be created: Unexpected (permanent) at  => failed to get current handle
', bindings/python/src/lib.rs:70:59
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
pyo3_runtime.PanicException: blocking layer must be created: Unexpected (permanent) at  => failed to get current handle

[messense]

That's odd, I've definitely rebased onto main before building... Anyway, it'd be nice to be able to use Operator with services that doesn't support blocking operations natively in Python.

[Xuanwo]

Thanks!