[Spike] Reliable Detection of Blocking WebRequest and Non-Blocking WebRequest from within the code

[whizzzkid]

Parent Issue: #1152

ETA: 2023-03-30

Unknowns

Beta Give feedback

1. Are webRequest manifest declarations compatible between browsers implementing blocking and non-blocking version of webRequest API?
2. Can non-blocking nature be identified at runtime?
3. If webRequest is blocking does the implementation works as expected?

[SgtPooki]

key thing we want to identify here is:

1. What code do we need to detect runtime capabilities

DONE:

code snippet available we can use to detect runtime capabilities that would be used in #1154