Update project to PyAnsys guidelines.

[Revathyvenugopal162]

PR description:

This PR mainly focusing to align the project to PyAnsys format.

Jobs:

• Add label workflow.
• Add isort style check.
• A src/ layout.
• Add CODE_OF_CONDUCT.
• Update workflow with tox.
• Remove setup.py.
• Add pyproject.toml

Note:

• Add isort for style check to sort python imports.
• Workflow will be Docs + Style -> Build +Test -> Release.
• The package is now build using flit.
• pyproject.toml - conf file to build the project with flit

Tools:

• tox - Tox is a tool that creates virtual env and installs the configured dependencies for those environments, for the purpose of testing. We used here tox for style checking. More data :PyAnsys-guideline / tox