[Feature Request] [Package System] Need a way to solve conflicts around different versions of the standard libraries

[fEst1ck]

🚀 Feature Request

We Need a way to solve conflicts around (transitively) depending on different versions of the standard libraries.

Motivation

Developers have been struggling with the following situation. Suppose I am developing a package P1 that uses some new features of Aptos Framework in the dev version, and we also import another package P2 that relies on the mainnet version of Aptos Framework. However, this is not allowed by the current package system. The package system maintains a global scope and addresses each dependency package by only the package name, and different versions of the same package will result in conflicting package names.