feat(typewriter): support aliased imports with tuple syntax

[mrgrain]

This PR adds support for aliased selective imports using an intuitive tuple syntax in the typewriter package.

Changes

• Updated importSelective() to accept mixed arrays of strings and tuples: ['regular', ['name', 'alias']]
• Added addAliasedImport() method for dynamic aliased imports
• Introduced internal aliasMap to track name-to-alias mappings
• Updated linkSymbol() to handle both regular and aliased imports
• Modified TypeScript renderer to emit proper import { name as alias } syntax
• Added comprehensive test coverage with inline snapshots
• Added extensive JSDoc documentation with examples

Usage

// Mixed regular and aliased imports
source.importSelective(target, ['RegularImport', ['LongName', 'Short']]);
// Generates: import { RegularImport, LongName as Short } from "source";

// Avoiding name conflicts
reactModule.importSelective(myModule, [['Component', 'ReactComponent'], 'useState']);
// Generates: import { Component as ReactComponent, useState } from "react";

[github-actions]

@aws-cdk/aws-service-spec: No model change detected