Add IMAP support

[jan-janssen]

Example

from gmailsorter import Imap

imap = Imap(
    host="imap.gmail.com",
    port=993,
    username="<your email>",
    password="<your password>",
    connection_str="sqlite:///email.db",
)
print(imap.labels)

# download messages and store them in database
imap.update_database(quick=False)

# get messages from database
imap.get_all_emails_in_database()

# train random forest model
imap.fit_machine_learning_model_to_database(
    n_estimators=100,
    max_features=400,
    random_state=42,
    bootstrap=True,
    include_deleted=False,
    max_workers=1,
)

# sort emails
imap.filter_messages_from_server(label="mailsortinbox", recommendation_ratio=0.9)

# close connection
imap.close()

[codecov]

Codecov Report

❌ Patch coverage is 99.75248% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.50%. Comparing base (a848892) to head (5fee179).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
gmailsorter/imap/__main__.py	96.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #445      +/-   ##
==========================================
+ Coverage   96.73%   97.50%   +0.77%     
==========================================
  Files          29       35       +6     
  Lines        1163     1484     +321     
==========================================
+ Hits         1125     1447     +322     
+ Misses         38       37       -1     

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