Update load_memory_tool.py and make query mandatory

[shu8hamrajput]

make query args required.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[gsarthakdev]

@shu8hamrajput Please sign a Contributor License Agreement (CLA) here to allow the repository maintainers to review the code.

[shu8hamrajput]

I've already signed CLA. IDK why it is still failing.
PS: this is my first contribution

UPDATE: figured it out after some efforts.