feat(semantic): check for invalid type import assignments

[DonIsaac]

Adds checks to TSImportEqualsDeclaration for invalid use of import type modifier.

import { Foo } from './foo'
namespace Bar {
  export class Baz {}
}

import type A = Foo.Baz;        // not allowed
import type B = Bar.Baz;        // not allowed
import type C = require('./c'); // allowed

[graphite-app]

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[codspeed-hq]

CodSpeed Performance Report

Merging #4097 will not alter performance

_{Comparing don/semantic/up/check-import-assignments (e386b62) with main (3fcad5e)}

Summary

✅ 29 untouched benchmarks

[graphite-app]

Merge activity

• Jul 7, 11:13 PM EDT: Dunqing added this pull request to the Graphite merge queue.
• Jul 7, 11:18 PM EDT: Dunqing merged this pull request with the Graphite merge queue.