Pre-release v2.0.0-rc3

Changes

• Simplified CMake, reduced to one level of CMake per project (sample-kernels and each example).
• Introduced the hekit central command with several subcommands,
  • init initializes the HE Toolkit;
  • fetch,build, install various steps in the fetch, build, and installation of components;
  • list list fetch, build, and install statuses of component instances;
  • remove remove components and instances instances;
  • new creates a new project;
  • docker-build new way of HE Toolkit docker builds;
  • algebras tool that provides BGV plaintext algebras.
  • check-dependencies check system dependencies.
• Tab completion of hekit and its subcommands.
• Recipe files for building libraries and HE Toolkit components.
• Addition of VS Code to docker build.
• Addition of pytests for testing the HE toolkit commands.
• Updated CI workflows.
  • Enable pylint.
• Documentation updates.

Co-Authored-by: @jlhcrawford
Co-Authored-by: @hamishun
Co-Authored-by: @denCalderon
Co-Authored-by: @ajagann
Co-Authored-by: @mkilari1