fix: exception name in python

[trim21]

Which issue does this PR close?

Closes #5452

Rationale for this change

after this patch:

Traceback (most recent call last):
  File "C:\Users\Trim21\proj\test\f.py", line 14, in <module>
    op.read("non-exists-path")
opendal.exceptions.NotFound: NotFound (permanent) at stat, context: { service: redis, path: non-exists-path } => kv doesn't have this path

What changes are included in this PR?

Are there any user-facing changes?

Yes, name in user exception message

[messense]

I'm not sure if we want to do a breaking change in a bugfix PR, can you split it into two PRs, one for the bugfix, another for the renames? Thanks!

[trim21]

I'm not sure if we want to do a breaking change in a bugfix PR, can you split it into two PRs, one for the bugfix, another for the renames? Thanks!

Would you mind explain why it's a breaking change? There is no actually rename in python level but only class qualname in error message changed.

[messense]

Oh right, I missed the exception_module.add part.

[messense]

Thanks!