Improve autocomplete and quickinfo for computation expression

**Is your feature request related to a problem? Please describe.**

I am trying to write a UI library and want to use computation expression for the DSL. But the intelligence for the CustomOperation is very bad because it offers you too much options and no filter for it. This can also benefit other CE style libraries like farm, Fshttp etc.

**Describe the solution you'd like**

Provide a filter or priorities for the CD's Custom Operation.

**Describe alternatives you've considered**
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**Additional context**
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