Matt Robinson 07f76275f1

feat: detect PGP encrypted content in partition_email and partition_msg (#1205) ...

### Summary

Closes #1018. Enables `partition_email` and `partition_msg` to detect if
an email has PGP encrypted content. Based on the specification in [RFC
2015](https://www.ietf.org/rfc/rfc2015.txt). The test emails are based
on the example email in the spec. If PGP detected content is detected, a
warning is emitted and an empty set of lists is returned.

### Testing

```python
from unstructured.partition_email import partition_email

filename = "example-docs/eml/fake-encrypted.eml"
partition_email(filename=filename)
```

```python
from unstructured.partition_msg import partition_msg

filename = "example-docs/fake-encrypted.msg"
partition_msgl(filename=filename)
```

2023-08-25 17:09:25 -07:00

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