Add support for module specifier "aliases" (tsconfig.paths mappings) when moving files/folders.

[tryggvigy]

tl;dr Add support for module specifier "aliases" (tsconfig.paths mappings) when moving files/folders.

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Let's say your tsconfig contains a paths mapping like this:

    "paths": {
      "Root/*": ["./*"]
    },

I noticed that

project.createDirectory('someDir');
const srcFile = project.getSourceFileOrThrow('someFile.ts');
srcFile.moveToDirectory('someDir');

will update all relative import/export specifiers referencing 'someFile.ts' but not if the specifier used an alias such as

import * from 'Root/someFile';

I expected ts-morph to update the specifier to import * from 'Root/someDir/someFile'; but it doesn't.
I think it would be nice feature to support this. VSCode can handle paths mapped import/exports when moving files.

Describe the solution you'd like

I think the problem is that updateStringLiteralReferences(nodeReferences: ReadonlyArray<[StringLiteral, SourceFile]>) { only updates the module specifier if it's a relative path like '../someFile' not if it's an module specifier alias like 'Root/someFile'.