Refactor domains to prevent import cycles and simplify maintenance

[fxamacker]

Issue to be solved

Currently, different domains are defined in these packages:

• common
• runtime
• stdlib

This can cause import cycles in future PRs that use domains across these packages. Also, having domains defined in different packages creates risk of overlooking domains.

Suggested Solution

We can define all domains in one place to help prevent import cycles and make it easier to maintain domains.