Maintenance: rename Tracer's folder to "packages/tracer"

[saragerion]

Bug description

More of a chore than a bug but the Tracer utility is called "Tracer" everywhere except than in the name of its containing folder.
This inconsistency causes annoyance and confusion, especially dealing with Github Actions.

Expected Behavior

Rename the current folder of the Tracer utility from:
packages/tracing
to
packages/tracer

Current Behavior

N/A

Possible Solution

N/A

Steps to Reproduce

N/A

Environment

• Powertools version used: all
• Packaging format (Layers, npm): NPM
• AWS Lambda function runtime: N/A
• Debugging logs: N/A

Related issues, RFCs

N/A

[dreamorosi]

You have no idea how many times I got this wrong lol

Just for documentation purposes, I want to link the issue where we decided this naming convention #26

[github-actions]

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