[WIP] FileSystem Client Create Directory Doesn't Set Properties/Encryption Context

[Copilot]

• Add EncryptionContext field to directory.CreateOptions struct in directory/models.go
• Update the format() method to pass the encryption context value to the generated client
• Add a test to verify the functionality of creating directory with encryption context
• Add a test to verify the functionality of creating directory with encryption context through filesystem client
• Test the changes to ensure they work correctly (unable to run tests directly)

The changes I've made:

1. Added the EncryptionContext field to the directory.CreateOptions struct in directory/models.go
2. Updated the format() method to pass this value to the generated client's options
3. Added tests for both directory client and filesystem client to verify the changes

These changes ensure that when creating a directory, users can specify the encryption context, which brings parity with the path API as requested in the issue.

Fixes #24010.

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