PYTHON-5677: ClientEncryption shouldn't try to load mongo crypt shared library

[aclark4life]

PYTHON-5677

Changes in this PR

• Pass bypass_encryption=True to skip loading crypt_shared.

Test Plan

• Rely on existing encryption tests to pass.

Checklist

Checklist for Author

• Did you update the changelog (if necessary)?
• Is there test coverage?
• Is any followup work tracked in a JIRA ticket? If so, add link(s).

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

[codeowners-service-app]

Assigned caseyclements for team dbx-python because sleepyStick is out of office.