chore: rename project to Powertools for AWS Lambda (.NET)

[sthulb]

Please provide the issue number

Issue number: #281

Summary

Changes

Please provide a summary of what's being changed

Located all references of Powertools/Lambda Powertools etc and updated to the new project name "Powertools for AWS Lambda"

Checklist

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• Meets tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

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[hjgraca]

@sthulb we will need to change the dependent repos. for instance Sam cli and aws lambda dotnet here and here for the new naming as well, right?

[sthulb]

@hjgraca yep, other repos are on my list to change too 😄 Starting with ours, moving on to other AWS repos, ideally everything will be merged at roughly the same time