Added Confidence Argument to keypoint detection model

[Greenstan]

Description

A new "Confidence" argument has been added to the keypoint detection model (based on the confidence argument found in the object detection model)

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)

How has this change been tested, please provide a testcase or example of how you tested the change?

A Dedicated keypoint detection model test file has been made with multiple test cases including one where the confidence is changed

Any specific deployment considerations

Docs

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2 out of 3 committers have signed the CLA.

:white_check_mark: Greenstan
:white_check_mark: SolomonLake
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[Greenstan]

@SolomonLake The Local path issues have been updated according to your suggestions as well as the switch to "with self.assertRaises(Exception):" and the env api-key variable.

[Greenstan]

All tests are now successful. The issue was with some referenced file paths