D335: Open sourcing process: use ansys-api-edb

[SMoraisAnsys]

This PR includes changes to move into public. The most relevant one is the use of the ansys-api-edb package.

Changes:

• remove proto files and use ansys-api-edb
• update build dependencies to match ansys-api-edb
• update project name and description
• remove python3.7 from ci_cd.yml, tox.ini and README.rst
• refact architecture to add core directory
• update licence year
• remove requirements files
• add optional dependencies (notebook, tests, doc) in pyproject.toml file and update README.rst, tox.ini and ci_cd.yml accordingly
• use PIP_EXTRA_INDEX_URL to leverage private pypi (where ansys-api-edb is available)
• change project extra deps to be compatible with private pypi

[SMoraisAnsys]

Closes #335