Use powertools for fetching secret

[deeheber]

The checkCurrentWeather function is currently using the AWS secrets manager lambda extension which is fine, but powertools released what appears to be a simpler abstraction (possibly on top of this extension).

Take a look into replacing the explicit use the lambda extension with powertools. https://docs.powertools.aws.dev/lambda/typescript/latest/utilities/parameters/

[deeheber]

We should probably look into doing #18 first because if this Lambda can be fully replaced with an http state then this issue won't be needed.

It's also possible that after researching how power tools works, we find that the current way of doing it is preferred. Would ideally like the abstraction that is most maintainable + easily readable in the code. Lambda powertools seems like a stable and supported library by AWS at the time of writing this.