Feat Installer and CICD nightly, beta, stable for cortexcpp

[hiento09]

Describe Your Changes

This PR does

• Add template CICD for compiling cortexcpp on windows, macos and linux
• Add template installer and uninstaller for cortexcpp
• Add CICD nightly, beta, stable build channel for cortexcpp

Fixes Issues

• Closes epic: Cortex.cpp Installer MVP (Local & Network Installer) #1030
• Closes epic: Stable, Beta and Nightly Builds #1065

You can try our installer at

• Windows: https://delta.jan.ai/cortex/0.5.0-32/windows-amd64/cortex-0.5.0-32-windows-amd64-installer.exe
• Linux: https://delta.jan.ai/cortex/0.5.0-32/linux-amd64/cortex-linux-amd64-installer-0.5.0-32.deb
• Mac intel: https://delta.jan.ai/cortex/0.5.0-32/mac-amd64/cortex-mac-amd64-installer-0.5.0-32.pkg
• Mac silicon: https://delta.jan.ai/cortex/0.5.0-32/mac-arm64/cortex-mac-arm64-installer-0.5.0-32.pkg

[dan-menlo]

@hiento09 I am approving this PR first as I don't want things to block things. I've left a few questions to help my understanding, if you don't mind.

Also, in future, I recommend breaking up a massive PR like this into smaller bite-sized ones:

• Per-OS PRs (e.g. linux, macos, windows)
• Helps discoverability, and clearer traceability for engineers

[dan-menlo]

@hiento09 FYI, I encountered a bug running cortex-nightly. Will create an issue