Add aidEncrypted metadata key to TenDI request

[capmonster-sdk-bot]

Context

The TenDI documentation (https://docs.capmonster.cloud/docs/captchas/tendi.txt) lists a new optional request parameter:

aidEncrypted (inside metadata) (string, optional): This parameter contains the Aid value, which must be obtained from the target website before creating a task. ... Important: this parameter is not used on all websites. If the website does not return Aid, you do not need to pass aidEncrypted. The aidEncrypted value is single-use: a new Aid must be obtained for each new task.

The docs' request example puts it into metadata next to captchaUrl.

Changes

• capmonstercloud_client/requests/TenDiCustomTaskRequest.py: aidEncrypted added to the allowed metadata keys, with a str type check in validate_metadata; metadata field description and class docstring updated. getTaskDict() already forwards metadata unchanged.
• test/tendi_test.py: tests for aidEncrypted together with captchaUrl, alone, and a wrong type being rejected.
• capmonstercloud_client/version.txt: 4.3.0 -> 4.3.1 (new parameter on an existing request).

Testing

python test/tendi_test.py (unittest).

Open questions

None.

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Prepared automatically by the SDK update bot. Please review before merging.