Add support for "export * as name from …"

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:
Resolves #82

Description

As this syntax is now stable, we should definitely support it. This extends the same logic to this syntax as we have for namespace imports, meaning that

import * as name from 'foo';
export {name};

and

export * as name from 'foo';

are equivalent up to the point that

// foo.js
export const foo = 1;
export const bar = 2;

// bar.js
export * as foo from './foo.js'

// baz.js
import {foo} from './bar.js';
console.log(foo.foo);

becomes

const foo = 1;
console.log(foo);

[codecov]

Codecov Report

Merging #3193 into master will increase coverage by 0.43%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3193      +/-   ##
==========================================
+ Coverage   90.19%   90.63%   +0.43%     
==========================================
  Files         167      167              
  Lines        5907     5905       -2     
  Branches     1797     1792       -5     
==========================================
+ Hits         5328     5352      +24     
+ Misses        350      336      -14     
+ Partials      229      217      -12

Impacted Files	Coverage Δ
src/ast/nodes/ExportAllDeclaration.ts	100% <ø> (+40%)	⬆️
src/finalisers/iife.ts	100% <ø> (+5.4%)	⬆️
src/finalisers/esm.ts	100% <100%> (+10%)	⬆️
src/finalisers/shared/getExportBlock.ts	100% <100%> (ø)	⬆️
src/utils/pluginDriver.ts	87.5% <100%> (ø)	⬆️
src/ast/nodes/NodeType.ts	100% <100%> (ø)	⬆️
src/Chunk.ts	92.89% <100%> (ø)	⬆️
src/utils/identifierHelpers.ts	100% <100%> (+16.66%)	⬆️
src/ast/nodes/ExportNamedDeclaration.ts	100% <100%> (+11.11%)	⬆️
src/finalisers/system.ts	96.47% <100%> (ø)	⬆️
... and 9 more

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