Restructure dependency handling in CMake.

[Ferroin]

Summary

First pass at cleaning up dependency handling in CMake:

• Move handling of truly mandatory dependencies to it’s own module.
• Move handling of TLS implementation to it’s own module.
• Move handling of optional compression libraries to their own module.
• For all above listed dependencies, reorder them to be checked early, with mandatory dependencies being checked first.
• For all above listed dependencies, shift to using the correct target_link_*, target_compile_*, and target_include_*` options for each part of the process of adding them to a target.
• Perform the same correctness fix mentioned above for most of the dependencies that are already modularized.

Test Plan

CI passes on this PR

Additional Information

There will likely be further PRs opened with similar changes in the future, but this one has intentionally been kept relatively small to simplify review.