fix(runtime-core): respect props from global mixins

[HcySunYang]

Fix: #1975

[yyx990803]

When reviewing this I realized two things:

1. props/emits options need to be resolved per instance/component combo due to global mixins
2. the resolved options must be cached on the component using app instance uid as key, since the same component may get used in different apps with different global mixins!
3. We can avoid all these normalizePropsOptions calls by storing the resolved options directly on the instance.

So that leads to some pretty substantial refactoring - see 8ed0b34 (which includes the test from this PR)