fix(noUnusedImports): don't report used val imported as type in an external module

[Conaclos]

Summary

Fix #3895

This PR changes how we bind ambient read to imported type.
Previously, we waited to get in the global scope to try binding an ambient read (read of a value in an ambient context) to an import type. However, external modules and namespaces can also import stuff.
I changed the code to support it in any scope.

Test Plan

I added a test

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	48595	48595	0
Passed	47403	47403	0
Failed	1192	1192	0
Panics	0	0	0
Coverage	97.55%	97.55%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	40	40	0
Passed	37	37	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.50%	92.50%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	6586	6586	0
Passed	2208	2208	0
Failed	4378	4378	0
Panics	0	0	0
Coverage	33.53%	33.53%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	680	680	0
Passed	608	608	0
Failed	72	72	0
Panics	0	0	0
Coverage	89.41%	89.41%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	18618	18618	0
Passed	14273	14273	0
Failed	4345	4345	0
Panics	0	0	0
Coverage	76.66%	76.66%	0.00%