Improve "Uncertainty Propagation" section

[KronosTheLate]

Tagging @giordano and @baggepinnen as the main contributors of the mentioned packages.

Hey guys. The JuliaPackageComparisons section on Uncertainty Propagation could use a helping hand, but I am not fit to write it. Could you help out by sharing your thoughts? I want to have more clear information about:

• The differences between your packages
• General recommendations. In the style of "For most users, A will be suitable. If you are doing X, you will want to use B. If performance is key, use C."
• I do not know about other packages in this domain. If you guys do, please mention them.

Also, is "Uncertainty Propagation" the best name? Both packages mention measurements, but that felt too general for me. Thoughts welcome.

If all you have time for is a brief comment, it's still super helpful. Getting some quality content from qualified people is the most important thing. If you find the time to make a PR, it would be fantastic.