Feat: add aws/ecrpublic module

[matiri132]

Description

This is the code for the issue: #1288
It creates the AWS ECR-Public module to interact with ECR public repositories.
Backward compatibility is maintained. The test temporarily creates a ECR public repository

Test outputs: https://gist.github.com/matiri132/e079eb89a61028ee89d244b991bc19bd

TODOs

• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• Include release notes. If this PR is backward incompatible, include a migration guide.

Release Notes (draft)

Added ecrpublc module to support interaction with ECR public repositories.

[ellisonc]

@matiri132 Thanks for the contribution, this is looking great so far. Tests are currently failing because we recently refactored our circleci contexts. can you rebase on master? that should fix the tests.