docs: change project name to "AWS Lambda Powertools for Java"

[saragerion]

Description of the improvement

Summary of the proposal

Change project name being referenced from these versions:

• AWS Lambda Powertools (Java)
• Lambda Powertools Java
• AWS Lambda Powertools Java

To this:
AWS Lambda Powertools for Java

See related RFC for more information

How, where did you look for information

• Readme files (root folder, nested project folders)
• Mkdocs files in docs
• Code
• ...

We probably need to do a text search in the whole repo.

Missing or unclear documentation

Inconsistent naming convention, see related RFC.

Improvement

A consistent name throught the project.

Related existing documentation

N/A

Related issues, RFCs

aws-powertools/powertools-lambda#80

[kozub]

Hey Team! I will take care of this issue.

edit: I didn't notice that an issue was already solved. I've double check it and there was one more rename required. PR's been merged: #789

[jeromevdl]

No more AWS Lambda Powertools Java or similar, we can close this one.