Feat(plugins): Add AVD String Formatter for later use in custom descriptions

[ClausHolbechArista]

Change Summary

Feat(plugins): Add AVD String Formatter for later use in custom descriptions

Proposed changes

• New string formatter, reusing parts of Python string.Formatter class.
• Support for upper
• Support for optional fields
• Support for prefix / suffix - useful with optional fields
• Protection against accessing internal objects.
• Easily extensible to add IP addressing or other things.

How to test

Added pytest

Checklist

User Checklist

• N/A

Repository Checklist

• My code has been rebased from devel before I start
• I have read the CONTRIBUTING document.
• My change requires a change to the documentation and documentation have been updated accordingly.
• I have updated molecule CI testing accordingly. (check the box if not applicable)

[github-actions]

Review docs on Read the Docs

To test this pull request:

# Create virtual environment for this testing below the current directory
python -m venv test-avd-pr-4432
# Activate the virtual environment
source test-avd-pr-4432/bin/activate
# Install all requirements including PyAVD
pip install "pyavd[ansible] @ git+https://github.com/ClausHolbechArista/avd.git@feat/plugins/format-strings#subdirectory=python-avd" --force
# Point Ansible collections path to the Python virtual environment
export ANSIBLE_COLLECTIONS_PATH=$VIRTUAL_ENV/ansible_collections
# Install Ansible collection
ansible-galaxy collection install git+https://github.com/ClausHolbechArista/avd.git#/ansible_collections/arista/avd/,feat/plugins/format-strings --force
# Optional: Install AVD examples
cd test-avd-pr-4432
ansible-playbook arista.avd.install_examples

[gmuloc]

nice PR!

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud