Build sentry from source

[PlasmaDev5]

WIP changes to build sentry-native from source.

Currently i have only tested/developed on windows and will not yet fully compile due to not linking libraries.
The changes here are based on UE4CMake with modification and cleanup to better function for the needs of sentry.
going forward further modification will be needed to add platform support for all our needs.
In addition we will need to load custom toolchains for some platforms.

TODO:

• Link generated libraries
• Android
• IOS
• Linux
• Mac
• Other Platforms

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- Build sentry from source ([#706](https://github.com/getsentry/sentry-unreal/pull/706))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

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